By rounding to the nearest whole numbers and estimating, it is confirmed that Ruben's answer of 96.52 ÷ 12.7 equals 7.6 is indeed reasonable.
Explanation:To assess if Ruben's answer that 96.52 ÷ 12.7 equals 7.6 is reasonable, let's consider the magnitude of the numbers involved. Firstly, we can simplify our estimation by rounding the numbers to the nearest whole digits, which gives us approximately 97 ÷ 13. By using division, we see that 13 goes into 97 about 7 times with some remainder, since 13 x 7 is 91, which is close to 97.
Now, 7.6 is indeed close to our estimation, so we can determine that Ruben's answer is within a reasonable range. Thus, the correct response to whether Ruben's calculation is reasonable would be:
D. Yes, Ruben's answer is reasonable.
What is the solution of the system of inequalities
Answer:
There are four (4) whole-number solutions to these inequalities:
... {(4, 1), (5, 0), (6, 0), (7, 0)}
Step-by-step explanation:
These are nicely solved by graphing. Whole numbers are non-negative integers, so x and y can be any values 0, 1, 2, .... The area of overlap on the graph clearly shows that y=0 and y=1 are the only viable choices for y, and that the values for x are limited in each of these cases.
Does anyone know this answer??
For this case we have the following equation:
[tex](2x + 3) ^ 2 + 8 (2x + 3) + 11 = 0[/tex]
Let [tex]u = 2x + 3[/tex]
We have:
[tex]u ^ 2 + 8u + 11 = 0[/tex]
By definition, given an equation of the form [tex]ax ^ 2 + bx + c = 0[/tex]
The quadratic formula, to find the solution can be written as:
[tex]x = \frac{-b+/-\sqrt{b ^ 2-4 (a) (c)} }{2(a)}[/tex]
In this case we have:
[tex]a = 1\\b = 8\\c = 11[/tex]
Substituting in the quadratic formula we have:
See attached image
Answer:
Option B
x = (- 7 ± √5) / 2
use the substitution u = 2x + 3
equation can now be written as
u² + 8u + 11 = 0
solve for u using the quadratic formula with a = 1, b = 8 and c = 11
u = ( - 8 ± √( 64 - 44 ) )/2
= ( - 8 ± √20 )/2 = ( - 8 ± 2√5 ) / 2 = - 4 ± √5
change the variable back into terms of x
2x + 3 = - 4 ± √5 ( subtract 3 from both sides )
2x = - 7 ± √5 ( divide both sides by 2 )
x = ( - 7 ± √5 ) / 2
juan is saving money for a trip. he has already saved 100 he saves 50 each week what would be the rate of change of the situation?
Answer:
The rate of change would be 50
Step-by-step explanation:
The rate of change in any equation is simply the amount in changes for every value of x. Since it goes up by 50 for every increase of the week, it means that the rate of change is 50.
Bonita said that the product of 5 6 56 × 1 2 3 23 is 7 3 73 . How can you tell that her answer is wrong?
the last digits of the numbers being multiplied are 6 and 3
resulting in a product of 18
thus the last digit in her answer would have to be an 8 not a 3
Find the equation of the line in slope-intercept form.Slope is 3/5 and (0, −2)
Answer:
[tex]y = \frac{3}{5}x - 2[/tex]
Step-by-step explanation:
Using the point slope form of a line equation, substitute m = 3/5 and the point (0,-2).
[tex]y - y_1 = m(x-x_1)\\y --2 = \frac{3}{5}(x - 0)\\y + 2 = \frac{3}{5}x \\ y = \frac{3}{5}x - 2 [/tex]
Question 2
Marilee spins the arrow on Spinner 1 and then spins the arrow on Spinner 2.
What is the sample space for this experiment?
A.) {A1, A2, B3, B4}
B.) {A1, B2, A3, B4}
C.) {A1, A2, A3, A4, B1, B2, B3, B4}
D.) {A1, B2}
Either A or B on Spinner 1 can be paired with any of 1, 2, 3, 4 on Spinner 2. The appropriate choice is ...
... C.) {A1, A2, A3, A4, B1, B2, B3, B4}
Lines AB and CD (if present in the picture) are straight lines. Find x. Give reasons to justify your solutions.
Answer:
x = 28°
Step-by-step explanation:
∠AOD and ∠BOC are vertical angles, hence congruent. That means the sum of ∠COE, ∠EOF, and ∠FOB is ∠BOC.
... 3x +x +(x+12°) = 152°
... 5x = 140° . . . . collect terms, subtract 12°
... x = 28° . . . . . . divide by 5
If line AB and CD are parallel to each other, hence the value of x from the given diagram is 39.2
To find the value of x from the given diagram, we will have to use the formula for finding the angle at a point.
The sum of all the angles at a point is 360 degreesTaking the sum of the angles and equating to 360 degrees is;152 + 3x + x + x + 12 = 360
152 + 12 + 5x = 360
164 + 5x = 360
5x = 360 -164
5x = 196
x = 196/5
x = 39.2
Hence the value of x from the given diagram is 39.2
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What are the steps for using a compass and straightedge to construct a line through point P that is parallel to line m? A horizontal line m and a point P are drawn. The point P is above the horizontal line m. Drag the steps and drop them in order from start to finish.
Answer:
Here's the list of the following sequence in the right order for you (I took the test myself and got this whole sequence right)
1. Use the straightedge to draw a line n that passes through P and intersects line m. Label the point of intersection as point X.
2. Place the point of the compass on point X and draw an arc that intersects lines m and n. Label the intersections as points A and B.
3. Without changing the width of the compass opening, place the point of the compass on point P and draw an arc that intersects line n. Label the intersection as point C.
4. Place the point of the compass on point A and open it to width AB.
5. With the compass opening set to width AB, place the point of the compass on point C and draw an arc that intersects the arc that was drawn from point P. Label the intersection of the arcs as point Y.
6. Use the straightedge to draw line PY.
Answer:
Here, m is a line and we have to find the draw parallel line of line of m through a point P with the help of straightedge and compass,
The correct order of steps for constructing a line through point P that is parallel to line m are as follows,
Step 1 : Use the straightedge to draw a line n that passes through P and intersect line m, lebel the point of intersection as X,
Step 2 : Place the point of the compass on point X and draw an arc that intersect line m and n, label the intersection point A and B,
Step 3 : Without changing the width of the compass opening, place the point of compass on point P and draw an arc that intersect line n label the intersection point as C,
Step 4 : Place the point of compass on point A and open it to the width of AB,
Step 5 : With the compass opening set the width of AB, place the point of the compass On point C and draw an arc that intersects the arc that was drawn from point P lebel the intersection of arc as point Y,
Step 6 : Use the straightedge to draw PY
What is the value of the expression? (5/2)2+33/4 Enter your answer in the box.
Answer:
Step-by-step explanation:
its 43
Which situation can be modeled by the inequality 5 + 10w ≥ 45? 50 pts!!!
Final answer:
The inequality models a situation where you have at least 45 dollars and you are adding $10 for each additional unit.
Explanation:
The inequality 5 + 10w ≥ 45 can be modeled by a situation where you have at least 45 dollars and you are adding $10 for each additional unit. Let's solve it step by step:
1. Subtract 5 from both sides of the inequality: 10w ≥ 40.
2. Divide both sides by 10: w ≥ 4.
The solution to the inequality is w ≥ 4. This means that the situation being modeled is where you have at least 4 units of something.
Which equation represents y = x2 − 10x + 30 in vertex form?
To complete the square, you can add (and subtract) the square of half the x coefficient.
... y = x² -10x + 30
... y = (x² -10x +25) + (30 -25)
... y = (x -5)² +5
In a table do you have to list the x and y coordinates in order (largest to smallest)?
Answer:
No. (maybe)
Step-by-step explanation:
For expressing the corresponding values of x and y, any ordering will do. It is usually convenient for the user of the table if there is some recognizable order (so that a value can be found without searching the entire table). The usual expected order is by x-value, smallest to largest.
Some problem statements may specify that the table entries be listed in order. In those cases, yes, the table values must be listed as specified. (This accounts for the (maybe) answer, above.)
please help! cube root
The principle of redundancy is used when system reliability is improved through redundant or backup components. Assume that a student's alarm clock has a 6.8% daily failure rate.
a. What is the probability that the student's alarm clock will not work on the morning of an important final exam?
nothing (Round to three decimal places as needed.)
b. If the student has two such alarm clocks, what is the probability that they both fail on the morning of an important final exam?
nothing (Round to five decimal places as needed.)
c. What is the probability of not being awakened if the student uses three independent alarm clocks?
nothing (Round to five decimal places as needed.)
d. Do the second and third alarm clocks result in greatly improved reliability?
A.
No, because total malfunction would still not be unlikely.
B.
No, because the malfunction of both is equally or more likely than the malfunction of one.
C.
Yes, because total malfunction would not be impossible, but it would be unlikely.
D.
Yes, because you can always be certain that at least one alarm clock will work.
Answer:
Step-by-step explanation:
let X be the random variable for number of times the clock fails .
X is Poisson with average = 6.8% = 0.0068
PDF of x = e^(-0.0068) 0.0068^x/x!
a) The probability that the student's alarm clock will not work on the morning of an important final exam = P(X=0) = 0.00675
b) If the student has two such alarm clocks, the probability that they both fail on the morning of an important final exam:
Since both clocks are independent prob for both failing is
P(x1 fails) *P(x2 fails) = 0.00675(0.00675) = 0.000455625
c) the probability of not being awakened if the student uses three independent alarm clocks = Prob for all 3 fails = 0.00675^3
= 0.00000307546
d) Yes. Because all three fail probability is almost zero.
D. Yes, because you can always be certain that at least one alarm clock will work.
A force of 50 pounds is exerted at an angle of 80 with the horizontal. What is its horizontal component?
a.9 lb.
b.29 lb.
c.49 lb.
Answer:
Option A is the correct answer.
Explanation:
Any vector can be resolved in to two components. Horizontal component and vertical component.
Consider a vector F which is at angle θ⁰ to the horizontal, we can resolve this vector in to two.
Horizontal component = F cos θ
Vertical component = F sin θ
Here we have Force , F = 50 pounds
Angle with horizontal = 80°
Horizontal component = F cos θ = 50* cos 80 = 8.68 pounds
≅ 9 lb.
Option A is the correct answer.
PLEASE HELP! 40 POINTS
In a particular year, a total of 44740 students studied in two of the most popular host countries when traveling abroad. If 5672 more students studied in the most popular host country than in the second most popular host country, find how many students studied abroad in each country!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I'd start with setting up the equations. Calling x the number of students in most popular country 1, and y in country 2.
x + y = 44740
x - y = 5672
now solve for x1 and x2. You can subtract second from first:
0 + 2y = 39068
y = 19534
so
x = 5672 + 19534 = 25206
Add a sentence to answer it in words.
total students= 44740 divided by 2 countries= 22370 for each country. if were trying to get a difference of 5672 students, then were gonna divide that 5672 by 2 which is gonna = 2836 students. country 1= 22370 students + 2836 of country 2's students. country 2 is 22370 students - 2836 students that we gave to country 1. so now, country 1 ends up with 25206 students, country 2 end up with 19534 students. a difference of 5672.
Find the point, M, that divides segment AB into a ratio of 5:5 if A is at (0, 15) and B is at (20, 0).
A) (35, 10)
B) (20, 10)
C) (10, 7.5)
D) (17.5, 5)
C
a ratio of 5 : 5 simplifies to 1 : 1, which basically means we require the midpoint of the line segment
using the midpoint formula
M = [[tex]\frac{1}{2}[/tex] (0 + 20 ), [tex]\frac{1}{2}[/tex] (15 + 0)] = (10, 7.5 )
Answer:
Option C). (10, 7.5)
Step-by-step explanation:
We have to find the coordinates of point M that divides the segment AB into a ratio of 5:5.
Vertices A and B are (0, 15) and (20, 0)
Ratio 5:5 is simply the ratio 1:1 means point M is the midpoint of segment AB.
So x-coordinate of M will be [tex]\frac{(20+0)}{2}=10[/tex]
and y - coordinate will be = [tex]\frac{(15+0)}{2}=7.5[/tex]
Therefore Option C. (10, 7.5) are the coordinates of point M.
The difference between 72 and 16
72 - 16 = 56
-Nicole :) <3
72 - 16 = 56
If a question says "find the difference" it usually means that you can use subtraction :)
write an equation for a function , g(x), that is obtained by shifting the graph of f(x)= | x | three units to the left, reflecting that result over the x-axis, and then translating the graph up four unita.
g(x) =- | x + 3 | + 4
adding 3 units to x shifts the graph 3 units to the left
the negative reflects the function in the x- axis
adding + 4 translates the graph vertically up by 4 units
What is the value of the expression? (5/2)2+3^3/4 Enter your answer in the box.
To evaluate the expression (5/2)^2 + 3^3/4, we simplify each part separately, then add the results. The final value of the expression is 13.
Explanation:To evaluate the expression (5/2)^2 + 3^3/4, we'll start by simplifying each part separately.
The first part, (5/2)^2, means we raise 5/2 to the power of 2. To do that, we multiply the numerator and denominator of 5/2 by itself:
(5/2)^2 = (5/2) x (5/2) = 25/4.
The second part, 3^3/4, means we raise 3 to the power of 3, and divide the result by 4:
3^3/4 = 27/4.
Now we can add the two simplified parts together:
(5/2)^2 + 3^3/4 = 25/4 + 27/4 = 52/4 = 13.
Tavon has a gift card for $ 50 that loses $ 2 for each 30-day period it is not used. He has another gift card for $ 40 that loses $ 1.50 for each 30-day period it is not used. a. Write and solve an equation for the number of 30-day periods until the value of the gift cards will be equal. b. What will the value of each card be when they have equal value?
To find the number of 30-day periods until the value of the gift cards will be equal, we set up and solve an equation. The value of each card will be $10 when they have equal value.
Explanation:To solve this problem, we can set up an equation to represent the value of each gift card over time and find when they will be equal.
Let x be the number of 30-day periods that have passed. After x periods, the value of the first gift card will be $50 - $2x, and the value of the second gift card will be $40 - $1.50x.
Setting the two expressions equal, we get:
$50 - $2x = $40 - $1.50x
Simplifying the equation, we have:
$10 = $0.5x
Dividing both sides by $0.5, we get:
x = 20
So, after 20 periods (or 20 months), the value of each gift card will be equal.
To find the value of each card at that point, we can substitute x = 20 into one of the expressions. Let's use the first gift card:
Value = $50 - $2(20) = $50 - $40 = $10
Therefore, when they have equal value, each gift card will be worth $10.
a store is having a dealer close-out sale. A computer desk, originally priced at $83, is now on sale for $78.85. what is the close-out discount rate? This is a percent of decrease.
A computer desk, originally priced at $83, is now on sale for $78.85
originally priced at $83. After discount the price becomes $78.85
Discount amount = $83 - $78.85 = $4.15
Decrease rate = discount amount divide by original price
Decrease rate = [tex]\frac{4.15}{83}= 0.05[/tex]
Decrease rate = 0.05
To find percent of decrease we multiply by 100
0.05 * 100 = 5%
Decrease percentage = 5%
6 divided by the difference of a number and 2, minus 5 divided by a number plus 2, equals 5 times the reciprocal of the difference of the number squared and 4. What is the number? Please help ASAP!!!!!!!!! :(
Answer:
-20
Step-by-step explanation:
Solve for y in the equation –11y = –143.
A. –13
B. –12
C. 12
D. 13
Choose the equation that could be used to solve this problem. The product of a number and 3 is 87. What is the number?
A) 3x = 87
B) x + 3 = 87
C) x 3 = 87
D) x − 3 = 87
A
in mathematics the product of numbers means multiply the numbers
let x be the number, then the product of x and 3 = 3x
the result of this multiplication is 87
so 3x = 87 is the equation to solve the problem
the solution is x = 29
The equation used to solve this problem is 3x = 87. The solution, found by isolating x, is 29.
Explanation:The equation that could be used to solve the problem 'The product of a number and 3 is 87. What is the number?' is 3x = 87. This equation represents 'the product of a number (x) and 3 equals 87'. You would solve this by dividing both sides by 3 to isolate x, resulting in the solution x = 29. Thus, the number that when multiplied by 3 equals 87 is 29.
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Use the drop-down menus to complete the statements about the function p(x) = x(x – 1) + 1.
The value of a is–1012 .
The value of b is–1012 .
The value of c is–1012 .
The value of the discriminant is–3–11 5 .
The quadratic function will intersect the x-axis 012 times.
Expanded, the function is ...
... p(x) = x² -x +1
Compared to
... ax² +bx +1
The value of a is 1The vaule of b is -1The value of c is 1The value of the discriminant is b²-4ac = 1²-4·1·1 = -3The quadratic function will intersect the x-axis 0 times._____
The negative discriminant means there are no real roots, hence no x-intercepts.
Answer: The value of a is 1. The value of b is -1. The value of c is 1. The value of the discriminant is -3. The quadratic function will not intersects the x-axis.
Explanation:
The standard form of a quadratic equation is,
[tex]ax^{2} +bx +c[/tex]
It can be written as,
[tex]x^{2} -x+1[/tex]
A triangle’s longest side is 8cm longer than the shortest side and 5cm linger than the third side. If the perimeter is 56cm find the Length of the three sides
The length of the three sides of the triangle is 17cm, 25cm, and 12cm.
Explanation:To solve this problem, let's assign variables to the three sides of the triangle. Let x represent the shortest side, (x + 8) represent the longest side, and (x - 5) represent the third side.
Using the perimeter given, we can set up an equation:
x + (x + 8) + (x - 5) = 56
Simplifying the equation, we have 3x + 3 = 56, then 3x = 53, and finally x = 17.
Therefore, the three sides of the triangle are:
Shortest side: 17cm
Longest side: 17 + 8 = 25cm
Third side: 17 - 5 = 12cm
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what is an equation in point-slope form for the line that passes through the points (4,-1) and (-3,4)?
y - 4 = - [tex]\frac{5}{7}[/tex](x + 3 )
the equation of a line in point-slope form is
y - b = m(x - a)
where m is the slope and (a, b) a point on the line
to calculate m use the gradient formula
m = (y₂ - y₁ ) / (x₂ - x₁ )
with (x₁, y₁ ) = (4, - 1) and (x₂, y₂ ) = (- 3, 4)
m = [tex]\frac{4+1}{-3-4}[/tex] = [tex]\frac{5}{-7}[/tex] = - [tex]\frac{5}{7}[/tex]
use either of the 2 points as a point on the line
using (a, b) = (- 3, 4 ), then
y - 4 = - [tex]\frac{5}{7}[/tex](x + 3 )
Divide and answer in simplest form: 5 ÷ 3/ 5
8 1/3 you have to do keep, change, flip
[tex]\frac{25}{3}[/tex]
change division to multiplication and turn the fraction upside down
5 ÷ [tex]\frac{3}{5}[/tex]
= 5 × [tex]\frac{5}{3}[/tex] = [tex]\frac{25}{3}[/tex] in simplest form
7:8:9=__:12:__ find the blanks. They are ratios PLEASE HELP
Answer: [tex]7:8:9 = 10.5:12:13.5[/tex]
Step-by-step explanation:
Suppose, [tex]7:8:9= x:12:y[/tex]
Now according to the ratio, the equations will be........
[tex]\frac{7}{8}=\frac{x}{12}\\ \\ 8x=7*12=84\\ \\ x=\frac{84}{8}=10.5[/tex]
and
[tex]\frac{8}{9}=\frac{12}{y}\\ \\ 8y=9*12=108\\ \\ y=\frac{108}{8}=13.5[/tex]
So, the ratio will be [tex]7:8:9 = 10.5:12:13.5[/tex]
The ratio is [tex]\boxed{7:8:9 = 10.5:12:13.5}[/tex].
Further Explanation:
Given:
The ratio is [tex]7:8:9[/tex] and is equal to [tex]{\text{\_\_\_}}:{\text{12}}:{\text{\_\_\_}}[/tex].
Calculation:
Consider the number in the first blank as [tex]x[/tex].
Consider the number in the second blank as [tex]y[/tex].
Therefore, the ratio is [tex]7:8:9[/tex] and is equal to [tex]{{x}}:{\text{12}}:{{y}}[/tex]
From the given equation the ratio of [tex]7:8[/tex] is equal to the ratio of [tex]x:12[/tex].
Now equate [tex]\dfrac{7}{8}[/tex] and [tex]\dfrac{x}{12}[/tex] to obtain the value of [tex]x[/tex].
[tex]\begin{aligned}\frac{7}{8} &= \frac{x}{{12}} \\ \frac{7}{8} \times 12 &= x \\ \frac{{21}}{2} &= x \\ 10.5 &= x \\ \end{aligned}[/tex]
Therefore, the value of [tex]x[/tex] is [tex]10.5[/tex].
From the given equation the ratio of [tex]8:9[/tex] is equal to the ratio of [tex]12:y[/tex].
Now equate [tex]\dfrac{8}{9}[/tex] and [tex]\dfrac{12}{{y}}[/tex] to obtain the value of [tex]y[/tex].
[tex]\begin{aligned}\frac{8}{9} &= \frac{{12}}{y} \\ \frac{9}{8} &= \frac{y}{{12}} \\ \frac{9}{8} \times 12 &= y \\ \frac{{27}}{2} &= y \\ 13.5&= y \\\end{aligned}[/tex]
Therefore, the value of [tex]y[/tex] is [tex]13.5[/tex].
Hence, the ratio is [tex]\boxed{7:8:9 = 10.5:12:13.5}[/tex].
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Answer details:
Grade: Middle School
Subject: Mathematics
Chapter: Ratio and Proportion
Keywords: number, reciprocal, fraction, ratio, equation, proportion, 7:8:9, fill blank.