For this case we must reduce the following fraction:
[tex]\frac {130xy} {50x}[/tex]
Canceling similar terms in the numerator and denominator:
[tex]\frac {130y} {50}[/tex]
Dividing by 10 the numerator and denominator we have:
[tex]\frac {13y} {5}[/tex]
Finally, the expression is reduced to:
[tex]\frac {13y} {5}[/tex]
Answer:
[tex]\frac {13y} {5}[/tex]
For the quadratic function below, what is the rate of change over the interval.
3 ≤ x ≤ 5
Answer:
2
Step-by-step explanation:
The rate of change of f(x) in the closed interval [ a, b ] is
[tex]\frac{f(b)-f(a)}{b-a}[/tex]
here [ a, b ] = [ 3, 5 }
and from the graph
f(b) = f(5 ) = 3 and f(a) = f(3) = - 1, hence
rate of change = [tex]\frac{3-(-1)}{5-3}[/tex] = [tex]\frac{4}{2}[/tex] = 2
The rate of change for a quadratic function isn't constant but can be averaged over an interval using the formula [f(b) - f(a)] / (b - a).
Explanation:The rate of change over a given interval for a quadratic function is not constant and varies with x. However, the function's average rate of change can be determined for an interval. This can be found by taking the difference in the function's value at the two endpoints of the interval, divided by the difference in x-values.
Without the specific function, I can't calculate the rate over the interval for you, but you can use this formula:
[f(b) - f(a)] / (b - a)
In your case, a = 3 and b = 5. So, just substitute these values (and the values of your function at these points) into that formula to find the average rate of change.
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What is the value of x?
Answer:
x = 30°Step-by-step explanation:
The angle 30° and 2x are complementary angles.
Two angles are called complementary angles, if their sum is one right angle (90°).
Therefore we have the equation:
30 + 2x = 90 subtract 30 from both sides
2x = 60 divide both sides by 2
x = 30
factor X^3-7x^2-5x+35 by grouping. What is the resulting expression
Answer:
(x-7) (x^2-5)
Step-by-step explanation:
x^3-7x^2-5x+35
Factor out an x^2 from the first two terms and -5 from the last 2 terms
x^2 (x-7) -5(x-7)
Factor out (x-7)
(x-7) (x^2-5)
Answer:
(x - 7) (x^2 - 5)
Step-by-step explanation:
Factor the following:
x^3 - 7 x^2 - 5 x + 35
Factor terms by grouping. x^3 - 7 x^2 - 5 x + 35 = (x^3 - 7 x^2) + (35 - 5 x) = x^2 (x - 7) - 5 (x - 7):
x^2 (x - 7) - 5 (x - 7)
Factor x - 7 from x^2 (x - 7) - 5 (x - 7):
Answer: (x - 7) (x^2 - 5)
A total of 3 cards are chosen at random, without replacing them, from a standard deck of 52 playing cards. What is the probability of choosing 3 king cards?
Answer:
1/5525 ≈ 0.018%
Step-by-step explanation:
There are 4 kings in a standard deck of 52 cards.
The probability that the first card is a king is 4/52.
The probability that the second card is also a king is 3/51 (the first king isn't replaced, so there's one less king and one less card in the deck).
The probability that the third card is a king is 2/50.
The probability of choosing 3 king cards is therefore:
P = (4/52) (3/51) (2/50)
P = (1/13) (1/17) (1/25)
P = 1/5525
P ≈ 0.018%
Calculate the arc length of GH in terms of pi.
Answer:
10π/3 mm
Step-by-step explanation:
Arc length is:
s = rθ × π/180
where r is the radius and θ is the angle in degrees.
Here, r = 10 mm and θ = 60°.
s = (10) (60) (π/180)
s = 10π/3
Another way to calculate it is to find the entire circumference then divide by 6, since 60° is one-sixth of 360°.
Gas station A has posted a chart that shows the price of gasoline in terms of the number of gallons. Gallons Price 3 9.15 5 15.25 7 21.35 Gas station B has an equation that represents the price, p, for gallons, g, of gasoline as p = $3.08g. Which gas station sells gasoline at a lower rate? What price does it charge? A. Gas station A sells gasoline at a lower rate. Its price is $3.08 per gallon. B. Gas station B sells gasoline at a lower rate. Its price is $3.05 per gallon. C. Gas station A sells gasoline at a lower rate. Its price is $3.05 per gallon. D. Gas station B sells gasoline at a lower rate. Its price is $3.08 per gallon.
Answer:
C. Gas Station A sells gasoline at a lower rate. Its price is $3.05 per gallon
Step-by-step explanation:
To answer this, all you need to do is first figure out how much per gallon each of the gas stations offer.
Because Gas station B is practically given to you by the equation, I'll show you how to interpret it:
p = $3.08g
p is the price
g is the gallon
So the price you will pay will be $3.08 times the number of gallons. This means that 1 gallon, if you substitute it will be $3.08.
This would eliminate options A and B.
Now to figure out how much Gas station A charges, just choose one of the prices. All we need to do is to divide the price given by the number of gallons:
[tex]3 gallons = \$ 9.15\\\\\dfrac{3gallons} {3}=\dfrac{\$9.15}{3}=\$3.05[/tex]
So Gas station A is lower than Gas station B.
Step-by-step explanation:
To answer this, all you need to do is first figure out how much per gallon each of the gas stations offer. Because Gas station B is practically given to you by the equation, I'll show you how to interpret it:p = $3.08gp is the priceg is the gallonSo the price you will pay will be $3.08 times the number of gallons. This means that 1 gallon, if you substitute it will be $3.08.This would eliminate options A and B.Now to figure out how much Gas station A charges, just choose one of the prices. All we need to do is to divide the price given by the number of gallons:So Gas station A is lower than Gas station B.
A normal distribution is bell-shaped and symmetric about its mean.
Please select the best answer from the choices provided
T F?
Answer:
True
Step-by-step explanation:
A normal distribution shows a dense center , which would be the mean. Given a population or sample, the bulk of the data would be found near the mean and and spreads out thinner towards the ends when the data is said to be normally distributed. When graphed you will see that the data form a bell-shaped curve.
Attached below is an example of how it would look:
Solve the inequality. -8 < 2x - 4 < 4
For this case we must solve the following inequality:
[tex]-8 <2x-4 <4[/tex]
Adding 4 in the parts of the inequality we have:
[tex]-8 + 4 <2x-4 + 4 <4 + 4\\-4 <2x <8[/tex]
Dividing between 2 each part of the inequality:
[tex]\frac {-4} {2} <\frac {2x} {2} <\frac {8} {2}[/tex]
[tex]-2 <x <4[/tex]
Answer:
[tex]-2 <x <4[/tex]
To solve the inequality -8 < 2x - 4 < 4, add 4 to each part to get -4 < 2x < 8, then divide by 2 to find -2 < x < 4.
To solve the inequality -8 < 2x - 4 < 4, we must isolate x. We do this in two steps, addressing each part of the compound inequality separately.
Add 4 to all three parts: -4 < 2x < 8.Divide all three parts by 2: -2 < x < 4.Therefore, the solution set is all x values between -2 and 4.
In △ABC,c=28, m∠B=92°, and a=38. Find b.
Answer:
=48.0
Step-by-step explanation:
In this problem we can use the cosine formula to find b.
b²=a²+c²-2acCosB
Where a, b and c are the sides of the triangle.
Substituting with the values from the question gives:
b²=28²+28²-2×38×28×Cos 92
b²=2302.26
b=√2302.26
=47.98
The side b=48.0 to the nearest tenth.
Derive the equation of the parabola with a focus at (4, −7) and a directrix of y = −15. Put the equation in standard form. (2 points) Question 5 options: 1) f(x) = one sixteenth x2 − 8x + 11 2) f(x) = one sixteenth x2 − 8x − 10 3) f(x) = one sixteenth x2 − x + 11 4) f(x) = one sixteenth x2 − x − 10
Answer:
[tex]\frac{1}{16} x^2-\frac{1}{2} x-10[/tex]
Step-by-step explanation:
When (x,y) is a point on the parabola, the distance from the focus is equal to its distance from the directrix.
Given point as (4,-7) and directrix as y=-15 then;
distance to focus=distance to directrix
Apply formula for distance
[tex]\sqrt{(x-4)^2+(y+7)^2} =(y+15)[/tex]
square both sides
[tex](x-4)^2+(y+7)^2=(y+15)^2\\\\\\x^2-8x+16+y^2+14y+49=y^2+30y+225\\\\\\\\x^2-8x+y^2-y^2+14y-30y+16+49-225=0\\\\\\16y=x^2-8x-160\\\\y=\frac{1}{16} x^2-\frac{1}{2} x-10[/tex]
Final answer:
The equation of the parabola with a focus at (4, -7) and a directrix of y = -15 is [tex]y = (1/16)x^2 - (1/2)x - 2.[/tex] However, none of the provided options match this equation, suggesting an error in the options or the interpretation of the question.
Explanation:
To derive the equation of a parabola with a focus at (4, -7) and a directrix of y = -15, we start by noting that the vertex lies midway between the focus and the directrix. The distance from the focus to the directrix is 8 units (|-7 - (-15)| = 8), thus the vertex is 4 units above the focus (at y = -3) and since the focus has an x-coordinate of 4, this is also the x-coordinate of the vertex. Therefore, the vertex is at (4, -3).
Next, we use the standard form of a vertical parabola (x-h)^2 = 4p(y-k), where (h,k) is the vertex and 4p is the distance from the vertex to the focus and the directrix. Because our parabola opens upwards (the focus is below the vertex), and the value of p is half the distance from the vertex to the focus or directrix, p = 4. Substituting h = 4, k = -3, and p = 4 into the equation yields [tex](x-4)^2 = 16(y+3[/tex]). We simplify the equation to:
x^2 - 8x + 16 = 16y + 48
By moving the term 16y to the left and then dividing all terms by 16, we get:
[tex]x^2/16 - x/2 + 1 = y + 3[/tex]
To obtain the standard form y = ax^2 + bx + c, we subtract 3 from both sides:
[tex]y = (x^2/16) - (x/2) + 1 - 3[/tex]
[tex]y = (1/16)x^2 - (1/2)x - 2[/tex]
The closest options provided in the question lack proper coefficients to match the derived equation, indicating a potential error in the provided options or in the interpretation of the question.
Quadrilateral ABCD is similiar to quadrilateral EFGH. The lengths of the three longest sides in quadrilateral ABCD are 20 feet, 18 feet, and 14 feet long. If the two shortest sides of quadrilateral EFGH are 6 feet long and 5 feet long, how long is the 4th side on quadrilateral ABCD?
Answer:
The 4th side on quadrilateral ABCD is [tex]11\frac{2}{3}\ ft[/tex]
Step-by-step explanation:
we know that
If two figures are similar, then the ratio of its corresponding sides is proportional and this ratio is called the scale factor
In this problem
The corresponding sides are
ABCD EFGH
20 ft ?
18 ft ?
14 ft 6 ft
? 5 ft
The length side of 14 ft in quadrilateral ABCD is the corresponding side to the length side of 6 ft in quadrilateral EFGH
so
the scale factor from quadrilateral ABCD to quadrilateral EFGH is
[tex]6/14=3/7[/tex]
therefore
To find the length of the 4th side on quadrilateral ABCD, divide the length of the 4th side on quadrilateral EFGH by the scale factor
so
[tex]5/(3/7)=35/3\ ft[/tex]
convert to mixed number
[tex]\frac{35}{3}\ ft=\frac{33}{3}+\frac{2}{3}=11\frac{2}{3}\ ft[/tex]
19. What are the coordinates of the midpoint
of the segment with endpoints at (-3, 9) and
(10, 18)?
Answer:
[tex]\large\boxed{\left(\dfrac{7}{2},\ \dfrac{27}{2}\right)}[/tex]
Step-by-step explanation:
The formula of a midpoint of a segment AB with endpoints at A(x₁, y₁) and B(x₂, y₂):
[tex]M_{AB}\left(\dfrac{x_1+x_2}{2},\ \dfrac{y_1+y_2}{2}\right)[/tex]
We have the points (-3, 9) and (10, 18).
Substitute:
[tex]M(x,\ y)\\\\x=\dfrac{-3+10}{2}=\dfrac{7}{2}\\\\y=\dfrac{9+18}{2}=\dfrac{27}{2}[/tex]
________ allows commuter expenses to be shared by sharing a car
Answer:
car pooling
Step-by-step explanation:
saves gas, 2 or more can ride fro the same price as 1
Carpooling allows commuter expenses to be shared by sharing a car as the fuel charge and parking charges are reduced.
What is carpool?Carpool is the sharing of car travel in order to travel more than one person in the car. The carpool save the need to drive the car by different person for the same location.
Benefits of carpooling-
Carpooling saves thye money as it required less fule to ride one car compare to saveral cars for different person.Carpooling is good for enviornment as with less number of cars, the emission of greenhouse gases will be less.It improves the relation between the co-workers or between the friends as they spend more time together.Hence, carpooling allows commuter expenses to be shared by sharing a car as the fuel charge and parking charges are reduced.
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Simplify 3(7-3) the second power -4(6+2)
Answer:
112
Step-by-step explanation:
3(7-3) = 3 x 4 = 12
12^2 = 144
144 -4(6+2)
144-4(8)
144-32
112
[tex]\bf \stackrel{\mathbb{P~E~M~D~A~S}}{3(7-3)^2-4(6+2)}\implies 3(\stackrel{\downarrow }{4})^2-4(\stackrel{\downarrow }{8})\implies 3(\stackrel{\downarrow }{16})-4(8) \\\\\\ \stackrel{\downarrow }{48}-4(8)\implies 48-\stackrel{\downarrow }{32}\implies 16[/tex]
what is the solution to this equation? 2(5x+8)=6x+20
Answer:
x = 1.
Step-by-step explanation:
2(5x + 8) = 6x + 20
10x + 16 = 6x + 20
10x - 6x = 20 - 16
4x = 4
x = 1.
To solve the equation 2(5x + 8) = 6x + 20, follow the steps of distribution, simplification, and isolation to find the solution x = 1.
Step 1: Distribute 2 to terms inside the parentheses on the left side of the equation: 10x + 16 = 6x + 20.
Step 2: Combine like terms on each side to simplify the equation: 10x - 6x = 20 - 16, which results in 4x = 4.
Step 3: Solve for x by isolating it: x = 4/4, hence x = 1.
solve this equation by using the quadratic formula
[tex]x {2}^{} + 3x = 0[/tex]
Which of the following is an odd function?
F(x)= 3x^2+x
F(x)=4x^3+7
F(x)=5x^2+9
F(x)=6x^3+2x
Answer:
[tex]\large\boxed{f(x)=6x^3+2x}[/tex]
Step-by-step explanation:
[tex]\text{If}\ f(-x)=f(x)\ \text{then}\ f(x)\ \text{is an even function.}\\\\\text{If}\ f(-x)=-f(x)\ \text{then}\ f(x)\ \text{is an odd function.}[/tex]
======================================================
[tex]f(x)=3x^2+x\\\\f(-x)=3(-x)^2+(-x)=3x^2-x\\\\f(-x)\neq f(x)\ \wedge\ f(-x)\neq-f(x)\\\\============================\\\\f(x)=4x^3+7\\\\f(-x)=4(-x)^3+7=-4x^3+7\\\\f(-x)\neq f(x)\ \wedge\ f(-x)\neq-f(x)\\\\============================\\\\f(x)=5x^2+9\\\\f(-x)=5(-x)^2+9=5x^2+9\\\\f(-x)=f(x)-\text{It's an even function}\\\\============================\\\\f(x)=6x^3+2x\\\\f(-x)=6(-x)^3+2(-x)=-6x^3-2x=-(6x^3+2x)\\\\f(-x)=-f(x)-\text{It's an odd function.}[/tex]
The function F(x)= 3x²+x is an odd function, option A is correct.
What is a function?A relation is a function if it has only One y-value for each x-value.
To determine whether a function is odd or not, we need to check if f(-x) = -f(x) for all x in the domain of the function.
Let's check the function
F(x) = 3x²+ x
F(-x) = 3(-x)² + (-x) = 3x²- x
-f(x) = -(3x² + x) = -3x² - x
Since F(-x) = -f(x), this function is odd.
The other functions are even as they satisfy f(-x)=f(x)
Hence, the function F(x)= 3x²+x is an odd function, option A is correct.
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I’m stuck!!! Please help
Answer:
I can not see it properly
Step-by-step explanation:
Answer:
D. 2.1 + 2x = 7.5
Step-by-step explanation:
The perimeter of a polygon is the sum of the lengths of all sides.
The sides here measure x, x, and y.
The perimeter of the triangle is x + x + y.
We are told the perimeter is 7.5
Now we have
x + x + y = 7.5
or
2x + y = 7.5
We are told y = 2.1, so we substitute 21.1 for y, and we get:
2x + 2.1 = 7.5
or
2.1 + 2x = 7.5
Answer: D. 2.1 + 2x = 7.5
Geometry Apex please help
Very true. Answer is choice A.
Geometry is a branch of mathematics that deals with the study of shapes and their properties. It involves concepts like points, lines, angles, and curves. Geometry is important in various fields and helps develop problem-solving skills.
Explanation:GeometryGeometry is a branch of mathematics that deals with the study of shapes, sizes, and properties of figures and spaces. It involves concepts like points, lines, angles, and curves, and explores their relationships and measurements. One important aspect of geometry is the study of geometric proofs, which are logical arguments that demonstrate the truth of mathematical statements.
For example, in a triangle, the sum of the three interior angles is always 180 degrees. This can be proven using the properties of parallel lines and transversals, and the fact that the angles in a straight line add up to 180 degrees.
Geometry is an essential part of mathematics education and is used in various fields such as architecture, engineering, and physics. It helps us understand and analyze the physical world around us, as well as develop critical thinking and problem-solving skills.
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factor 125x3 + 343y3
Answer:
(5x + 7y)(25x² - 35xy + 49y²)
Step-by-step explanation:
125x³ + 343y³ ← is a sum of cubes and factors in general as
a³ + b³ = (a + b)(a² - ab + b² )
125x³ = (5x)³ ⇒ a = 5x
343y³ = (7y)³ ⇒ b = 7y
125x³ + 343y³
= (5x + 7y)((5x)² - (5x × 7y) + (7y)²)
= (5x + 7y)(25x² - 35xy + 49y²) ← in factored form
Which explains whether Triangle FGH is congruent to Triangle FJH?
Answer:
The correct answer is third option
They are not congruent, because only one pair of corresponding sides is congruent.
Step-by-step explanation:
From the figure we can see that, two isosceles triangles.
ΔFGH and ΔFJH
We get FG = GH and FJ = HJ
And side FH is common for both the triangles.
We can not say these two triangles are congruent.
Therefor the correct answer is third option
They are not congruent, because only one pair of corresponding sides is congruent.
Final answer:
The congruency between Triangle FGH and Triangle FJH can be considered through Desargues's theorem, which relates congruency to parallel sides and intersecting vertex connections, and similarity can also be established by the AAA theorem, which involves congruent corresponding angles.
Explanation:
To determine whether Triangle FGH is congruent to Triangle FJH, one would need to employ the principles of Desargues's theorem, which states that if two triangles have their corresponding vertices connected by lines that meet at a point, and if the corresponding sides of the triangles are parallel, then the triangles are congruent. The information given suggests multiple instances where triangles are similar or congruent based on the congruency of angles or parallelism of lines, as dictated by the aforementioned theorem. For example, in the triangles ABC and FCE mentioned, the similarity is confirmed via the Angle Angle Angle (AAA theorem) because all corresponding angles of the triangles are congruent, which is a direct consequence of the vertical angles property and the alternate interior angles property. This similarity implies that there's a proportionality between the sides of the triangles, which could be a stepping stone in proving the congruency between Triangle FGH and Triangle FJH if similar conditions apply.
A new movie is released each year for 8 years to go along with a popular book series. Each movie is 5 minutes longer than the last to go along with a plot twist. The first movie is 75 minutes long. Use an arithmetic series formula to determine the total length of all 8 movies.
Answer:
The total length of all 8 movies is 740 minutes
Step-by-step explanation:
* Lets revise the arithmetic series
- In the arithmetic series there is a constant difference between
each two consecutive numbers
- Ex:
# 2 , 5 , 8 , 11 , ………………………. (constant difference is 3)
# 5 , 10 , 15 , 20 , ………………………… (constant difference is 5)
# 12 , 10 , 8 , 6 , …………………………… (constant difference is -2)
* General term (nth term) of an Arithmetic series:
- If the first term is a and the common diffidence is d, then
U1 = a , U2 = a + d , U3 = a + 2d , U4 = a + 3d , U5 = a + 4d
So the nth term is Un = a + (n – 1)d, where n is the position of the
number in the series
- The formula to find the sum of n terms is
Sn = n/2 [a + l] , where l is the last term in the series
* Lets solve the problem
- A new movie is released each year for 8 years to go along with a
popular book series
∴ n = 8
- Each movie is 5 minutes longer than the last
∴ d = 5
- The first movie is 75 minutes long
∴ a = 75
- To find the total length of all 8 movies find the sum of the 8 terms
∵ Un = a + (n - 1)d
∵ The last term l is u8
∵ a = 75 , d = 5 , n = 8
∴ l = 75 + (8 - 1)(5) = 75 + 7(5) = 75 + 35 = 110
∴ l = 110
∵ Sn = n/2 [a + l]
∴ S8 = 8/2 [75 + 110] = 4 [185] = 740 minutes
* The total length of all 8 movies is 740 minutes
The total length of all 8 movies, using the arithmetic series formula, is 740 minutes. Each movie increases by 5 minutes, starting from 75 minutes. The last movie is 110 minutes long.
Calculating the Total Length of All 8 Movies Using an Arithmetic Series Formula
To determine the total length of the 8 movies, we can use the formula for the sum of an arithmetic series:
→ [tex]S_n[/tex] = n/2 × (a + l)
Where:
→ [tex]S_n[/tex] is the total length of all movies
→ n is the number of terms (movies)
→ a is the first term (length of the first movie)
→ l is the last term (length of the last movie)
Given:
→ a = 75 minutes (first movie)
→ d = 5 minutes (increase in length per movie)
→ n = 8 (total number of movies)
First, we find the length of the last movie using the formula for the nth term of an arithmetic series:
→ l = a + (n - 1) × d
Thus:
→ l = 75 + (8 - 1) × 5
= 75 + 35
= 110 minutes
Next, we use the sum formula:
→ [tex]S_n[/tex] = n/2 × (a + l)
→ [tex]S_8[/tex] = 8/2 × (75 + 110)
= 4 × 185
= 740 minutes
So, the total length of all 8 movies is 740 minutes.
The equation tan(x- pi/6) is equal to _____.
The equation tan(x- pi/6) is equal to (√3tanx - 1)/(√3 + tanx).
To solve the equation [tex]\(\tan(x - \frac{\pi}{6})\)[/tex], we can use the tangent sum formula, which states that for any angles [tex]\(A\)[/tex] and [tex]\(B\)[/tex]:
[tex]\[\tan(A - B) = \frac{\tan(A) - \tan(B)}{1 + \tan(A)\tan(B)}\][/tex]
Let [tex]\(A = x\)[/tex] and [tex]\(B = \frac{\pi}{6}\)[/tex]. We know that [tex]\(\tan(\frac{\pi}{6}) = \frac{1}{\sqrt{3}}\)[/tex] .
Applying these values to the formula, we get:
[tex]\[\tan(x - \frac{\pi}{6}) = \frac{\tan(x) - \frac{1}{\sqrt{3}}}{1 + \tan(x)\frac{1}{\sqrt{3}}}\][/tex]
[tex]\[\tan(x - \frac{\pi}{6}) = \frac{\tan(x) - \frac{1}{\sqrt{3}}}{1 + \tan(x)\frac{1}{\sqrt{3}}} \cdot \frac{\sqrt{3}}{\sqrt{3}}\][/tex]
[tex]\[\tan(x - \frac{\pi}{6}) = \frac{\sqrt{3}\tan(x) - 1}{\sqrt{3} + \tan(x)}\][/tex]
Manny has 48 feet of wood. He wants to use all of it to create a border around a garden. The equation can be used to find the length and width of the garden, where l is the length and w is the width of the garden. If Manny makes the garden 15 feet long, how wide should the garden be? 9 feet 18 feet 30 feet 33 feet
Answer:
9 ft
Step-by-step explanation:
So let's assume the shape is rectangular.
The perimeter of the rectangle with dimensions l and w is: 2w+2l.
We are given 48 feet of wood so we want 2w+2l=48.
Manny wants l to be 15 so insert this into equation: 2w+2(15)=48.
Now we need to solve
2w+2(15)=48
Multiplying 2 and 15:
2w+30=48
Subtract 30 on both sides:
2w =18
Divide both sides by 2:
w =9
We want the width to be 9 ft.
I need the answer for a & b
Answer:
a. 2.14% should have IQ scores between 40 and 60
b. 15.87% should have IQ scores below 80
Step-by-step explanation:
* Lets explain how to solve the problem
- For the probability that a < X < b (X is between two numbers, a and b),
convert a and b into z-scores and use the table to find the area
between the two z-values.
- Lets revise how to find the z-score
- The rule the z-score is z = (x - μ)/σ , where
# x is the score
# μ is the mean
# σ is the standard deviation
* Lets solve the problem
- IQS are normally distributed with a mean of 100 and standard
deviation of 20
∴ μ = 100 and σ = 20
a.
- The IQS is between 40 and 60
∴ 40 < X < 60
∵ z = (x - μ)/σ
∴ z = (40 - 100)/20 = -60/20 = -3
∴ z = (60 - 100)/20 = -40/20 = -2
- Use the z table to find the corresponding area
∵ P(z > -3) = 0.00135
∵ P(z < -2) = 0.02275
∴ P(-3 < z < -2) = 0.02275 - 0.00135 = 0.0214
∵ P(40 < X < 60) = P(-3 < z < -2)
∴ P(40 < X < 60) = 0.0214 = 2.14%
* 2.14% should have IQ scores between 40 and 60
b.
- The IQS is below 80
∴ X < 80
∵ z = (x - μ)/σ
∴ z = (80 - 100)/20 = -20/20 = -1
- Use the z table to find the corresponding area
∵ P(z < -1) = 0.15866
∵ P(X < 80) = P(z < -1)
∴ P(X < 80) = 0.15866 = 15.87%
* 15.87% should have IQ scores below 80
Last week Lisa had gross earning of $441.30. Cathy receives a base salary of $375 and a commision on sales exceeding her quota of $5000. What is her rate of commision if her sales were $6560?
Final answer:
Cathy's commission rate is calculated by subtracting her base salary from her gross earnings and then dividing the commission amount by her sales exceeding the quota, resulting in a rate of 4.25%.
Explanation:
To calculate Cathy's commission rate, we need to determine how much she earned from sales that exceeded her quota. Cathy's sales were $6560, and her quota is $5000, meaning she exceeded her quota by $1560 ($6560 - $5000).
As her gross earnings were $441.30, we also need to account for her base salary of $375, which leaves $66.30 ($441.30 - $375) as the amount earned from commission.
Finally, to find the commission rate, we divide the commission amount by the sales that exceeded the quota, which is $66.30 / $1560.
Therefore, Cathy's commission rate is 4.25% (rounded to two decimal places).
Express 3/4 in sixty-fourths
Help me pls
3/4 = X/64
Divide 64 by 4, then multiply 3 by that number:
64/4 = 16
3 x 16 = 48
3/4 = 48/64
What is the equation of the line?
y=3x
Y=1/3x
Y=1/3x+2
Y=3x+2
Answer:
Y = 1/3x + 2
Step-by-step explanation:
Since the line increases by 1 unit then goes to right 3 units the line equation must have a slope of 1/3 and must have a y intercept of + 2 since the line crosses the Y axis at +2
Answer: y=1/3x+2 is the correct answer just took the test
Step-by-step explanation:
Need help here, please.
Identify the vertex of y = x2 + 4x + 5.
A. (0,0)
B. (–2,9)
C. (–2,1)
D. (4,5)
Answer:
Option C is correct.
Step-by-step explanation:
y = x^2+4x+5
We need to find the vertex of the above equation.
The above equation represents the parabola.
The slope of parabola can be found by taking derivative of the given equation
dy/dx = 2x+4
The slope of the parabola at the vertex is zero SO,
2x+4 = 0
2x = -4
x = -4/2
x = -2
Putting value of x =-2 to find the value of y
y = x^2+4x+5
y =(-2)^2+4(-2)+5
y = 4-8+5
y =9-8
y = 1
So, the vertex is (-2,1)
Option C is correct.
What is the measure of EFG in 0 0 below?
O
A. 240°
O
B. 120°
O
C. 300
O
D. 60°
Answer:
C. 300
Step-by-step explanation:
EFG and EG is the total distance around the circle
EFG + EG = 360 degrees
EFG + 60 = 360
Subtract 60 from each side
EFG +60-60 = 360-60
EFG = 300
Answer:
C. [tex]\widehat{GFE}=300^{\circ}[/tex]
Step-by-step explanation:
We have been given an image of a circle. We are asked to find the measure of major arc EFG for our given circle.
First of all, we will find measure of arc GE.
We know that the measure of central arc is equal to its subtended arc. The measure of arc GS will be equal to measure of central angle GOE.
Since measure of central angle GOE is 60 degree, so measure of arc GE is 60 degrees as well.
We know that the circumference of circle is equal to 360 degrees. So we can set an equation as:
[tex]\widehat{GE}+\widehat{GFE}=360^{\circ}[/tex]
[tex]60^{\circ}+\widehat{GFE}=360^{\circ}[/tex]
[tex]60^{\circ}-60^{\circ}+\widehat{GFE}=360^{\circ}-60^{\circ}[/tex]
[tex]\widehat{GFE}=300^{\circ}[/tex]
Therefore, the measure of arc GFE is 300 degrees and option C is the correct choice.