Answers
Related Questions
the mean mark for the class was 70%. There are 30 students in the class, 20 of whom are boys. The mean mark for the boys is 62%. What is the mean mark for the girls?
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Total marks for the class = 70 x 30 = 2100
Mean mark for the boys = 62%
Total marks for the boys = 62 x 20 = 1240
Total marks for the girls = 2100 - 1240 = 860
Mean marks for the girls = 860 ÷ 10 = 86%
Answer: 86%
Please help me idk this
Answers
1- You have the following information given in the problem above:
- The jug helds 16 cups of milk.
- Isaac drank 1 7/8 cups and his brother drank 1 1/2 cups.
2- Keeping this on mind, you have:
1 7/8=15/8
1 1/2=3/2
=16 cups-15/8 cups-3/2 cups
=101/8 cups
The answer is: 101/8 cups
A travel website reports that in a particular city, the probability of rain on any day in April is 40%. What is the expected number of rainy days in this city during the month of April?
Answers
0.4(30)
(0.4 represents 40%)
Multiply:
0.4(30) = 12
The expected amount of rainy days is 12 days.
Convert 7.2*10^-3 to standard form please help thanks
Answers
=7.2 * 10^−3=7.2 * 1/10*10*10=0.0072
Hope this helps!!
Jake is younger than Sophie. Sophie is 14 years old. Write an inequality that compares Jake's age in years, (j), to Sophie's age.
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To express that Jake is younger than Sophie who is 14, we use the inequality j < 14, where j symbolizes Jake's age in years.
Explanation:The question is asking for an inequality that represents Jake's age compared to Sophie's age. Since we are told that Jake is younger than Sophie and Sophie is 14 years old, we can use an inequality symbol to express this relationship. The appropriate inequality is j < 14, where j represents Jake's age in years. The symbol < means 'less than,' which correctly compares Jake's age to Sophie's, indicating that Jake's age is less than 14 years.
The quarters, buckled, and dimes totaled 20 and their value was $2.05. How many kind were there if there were 3 times as many dimes as quarters
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Let q, n, d represent the numbers of quarters, nickels, and dimes, respectively. Then you have three equations in the unknowns:
q +n +d = 20
25q +5n +10d = 205
-3q +d = 0
A calculator can give the solution to this matrix equation in short order. It is
q = 3
n = 8
d = 9
There are 3 quarters, 8 nickels, and 9 dimes.
_____
If you use the third equation to write an expression for d, you can substitute that into the other two equations.
q +n +3q = 20
25q +5n +10(3q) = 205
Simplifying, these are
4q +n = 20
11q +n = 41
Subtracting the first from the second, we find
7q = 21
q = 3
From there, it is easy to find d=9, n=8.
Kali invests $3516 in a savings account with a fixed annual interest rate of 7% compounded 3 times per year. What will the account balance be after 7 years
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Someone please help me?
Answers
CBD = 180 - 98/2
CBD = 180 = 49
CBD = 131
Answer is the third one
Nikolai has a jar filled with 120 marbles. he has 72 red marbles, 17 blue marbles, 13 green marbles, and 18 purple marbles. what is the probability that he will randomly select a blue marble, without replacement, and then a purple marble from the jar
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Probability of choosing a blue marble: 17/120
Probability of choosing a purple marble: 18/119
17/120 x 18/119 = 3/140
You will have a 3/140 chance of both of these occurring.
The probability of selecting a blue marble followed by a purple marble from a jar containing 120 marbles with different colors is approximately 2.2%.
The probability of grabbing a blue marble and then a purple marble is determined by multiplying the probability of grabbing a blue marble first and the probability of grabbing a purple marble second. Here's the calculation:
Probability of selecting a blue marble first: 17/120
Probability of selecting a purple marble second (after one blue marble is already taken out): 18/119
Multiplying the probabilities: (17/120) * (18/119) ≈ 0.022, or 2.2%
What are the coordinates of the vertex of the table? Is it a minimum or a maximum?
x y
0 1
-1 -2
-2 -3
Question 1 options: A.(-4, 1); minimum B.(-2, -3); maximum C.(-2, -3); minimum D.(1, 0); maximum.
pleeeeeeeeez help me
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A (0,1)
B(-1,-2)
C(-2,-3)
using a graph tool
see the attached figure
the vertex is the point C (-2,-3) is a minimum
the answer is
minimum (-2, -3)
Your job pays 6$ per hour write a variable expression for your pay in dollars for working h hours what is your Pay if you work 32 hours
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Fill in 32 for h
6x32
For 32 hours, you would earn $192
Solve for c in the equation 3x^2-18x+5=47
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The general quadrilatic equation is ax²+bx+c=0.
So, arranging the equation in this form we get,
3x²-18x+5-47=0
3x²-18x-42=0
The value of C = -42
How many arrangements are possible using the letters in the word fuzzy if each letter "z" is distinctly different than the other? how many arrangements are possible if the letter "z" is interchangeable with the other? explain your reasoning?
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First answer is 5!, second answer is 5!/2 because swapping two z's does not generate a new permutation.
Case 1: If the letter z is distinctly different
If we have the letter z which is distinctly different than the other "z", then we have five letters in the word F U Z Z Y and the number of arrangements would be = 5*4*3*2*1 =5! = 120 different arrangements
Case 2: If the letter Z is interchangeable
If the letter "Z" is interchangeable with the other "z" then we have 2 letters which cancel out each other that would be represented by 2*1 = 2! = 2
So, the number of arrangements in this case would be 5!/2! = 5*4*3*2*1/2*1 = 60 arrangements
please help no will mark brainlyst
Explain how you would find 90% of 120.
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land is the same as the correspondent in "number" land; so we can write:
100%
90%
= 120x
Where X is the correspondent of 90% in numbers.
Rearranging: x = 120⋅
90% 100% =108
To find out you will have to multiply 90 with 120 and then divide what you get with 100.
90 x 120 = 10800
10800/100 = 108
so 90% of 120 is 108.
Hope this helped :)
Silvia wants to retire at 65 and live on $40,000 a year. How much does she need to save to ensure that her retirement funds last until she is 85?
Select the best answer from the choices provided.
$800,000 because she will need to save for 20 years times $40,000
more than $800,000 because taxes and inflation will increase the value of her savings
less than $800,000 because returns will continue to increase the amount in her savings even after retirement
more than $800,000 because compound return will reduce her savings
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Answer:
$800,000 because she will need to save for 20 years times $40,000
Step-by-step explanation:
Silvia wants to retire at 65 and live on $40,000 a year.
She wants to live till 85 and retire at 65 years.
So, number of years to save = [tex]85 -65= 20[/tex]
And she needs to save [tex]40000\times20=800000[/tex]
Hence, she must save 800,000.
Which of the following sequences of numbers are arithmetic sequences? Check all that apply.
A.99, 100, 101, 102, 103, ...
B.-3, -5, -7, -9, -11, ...
C.2, -2, 2, -2, 2, ...
D.1, 6, 11, 16, 21, ...
E.-4, 7, -10, 13, -16, ...
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__________________
If we observe the given options, we can note:
In option A, the difference between two consecutive terms is the same and is equal to 1.
In option B, the difference between two consecutive terms is the same and is equal to -2.
In option C, the difference is not the same.
In option D, the difference between two consecutive terms is the same and is equal to 5.
In option E, the difference is not the same.
So, the correct options are A,B and D
A-Town wants to know the number of cell phones in each household the town divides the population up by neighborhood and surveys a random number of households and eat what type of survey is this
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A-Town is conducting a survey using a random sample method by dividing the population into neighborhoods and surveying random households in each, which ensures each household has an equal chance of being selected and provides a representative sample.
Explanation:A-Town's approach to determining the number of cell phones in each household through a survey is an example of a random sample. The method involves dividing the population into neighborhoods and surveying a random selection of households within each area. This technique helps to ensure that every household has an equal chance of being selected, which should provide a representative sample of the town's population. Such methods are necessary to obtain reliable data that reflects the true distribution and characteristics of the target population without regional bias.
Using a representative sample is crucial in research and polling to measure accurately public opinion or collect data on phenomena. As in the given example where the market research firm surveys 500 randomly selected residents to estimate the percentage of adults with cell phones, the firm employs statistical measures like confidence intervals to infer about the entire population's cell phone ownership based on the sample data. Moreover, the concept of probability sampling is also important for achieving a sample that can be generalized to the whole population with reasonable accuracy.
Which line of symmetry for the parabola (x-1)^2= 4(y-1)^?
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Vertex of the parabola (1,1).
So line symmetry is x=1.
The line of symmetry for the parabola is x = 1.
The line of symmetry for the parabola is x = 1. In the given equation (x-1)^2 = 4(y-1)^2, the x-coordinate of the vertex is 1, which means the line of symmetry is a vertical line passing through x = 1.
A die is thrown twice. What is the probability that:
1. Neither a doublet ordered pair nor a total of 10 will appear?
2. Neither a multiple of 2 on the first throw nor a total of 6 will appear?
A. 7/9
B. 5/12
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2.) B would be your answer.
Answer:
1.)- B. 5/12
2)- A. 7/9
Step-by-step explanation:
Sandy releases a javelin 1.6 m above the ground with an initial vertical velocity of 25 m/s. How long will it take the javelin to hit the ground?
Answers
A(t)=V'(t)=S''(t)
A(t)=-9.8m/s
⇒V(t)=-9.8t/1+C m/s
Where C is the initial velocity:
⇒V(t)=-9.8t+25
⇒S(t)=-9.8t²/2+25t/1+C
⇒S(t)=-4.9t²+25t+C
but the C is the initial vertical displacement, hence:
S(t)=-4.9t²+25t+1.6m
The time taken to hit the ground will therefore be:
S(t)=0
-4.9t²+25t+1.6=0
Using a quadratic function, it is found that it will take 5.17 seconds for the javelin to hit the ground.
What is the quadratic function for a projectile's height?Considering meters as the measure of height, it is given by:
h(t) = -4.9t² + v(0)t + h(0).
In which:
v(0) is the initial velocity.h(0) is the initial height.In this problem, we have that v(0) = 25, h(0) = 1.6, hence:
h(t) = -4.9t² + 25t + 1.6
It hits the ground when h(t) = 0, hence:
-4.9t² + 25t + 1.6 = 0
4.9t² - 25t - 1.6 = 0.
Which is a quadratic function with coefficients a = 4.9, b = -25, c = -1.6. Hence:
[tex]\Delta = (-25)^2 - 4(4.9)(-1.6) = 656.36[/tex]
[tex]x_1 = \frac{25 + \sqrt{656.36}}{9.8} = 5.17[/tex]
[tex]x_2 = \frac{25 - \sqrt{656.36}}{9.8} = -0.06[/tex]
For time we want the positive value, hence, it will take 5.17 seconds for the javelin to hit the ground.
More can be learned about quadratic functions at https://brainly.com/question/24737967
#SPJ2
Determine the number of real solutions for each of the given equations. Equation Number of Solutions y = -3x2 + x + 12 y = 2x2 - 6x + 5 y = x2 + 7x - 11 y = -x2 - 8x - 16
pppppppllllllleeeeaaaassssseeeee ANSWER FASRT
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if its <0, no real soln
its =0, 1 real soln
its >0, 2 real solns
for
y = -3x2 + x + 12, 1^2-4(-3)(12) > 0, two solns
y = 2x2 - 6x + 5, -6^2-4(2)(5) < 0, no soln
y = x2 + 7x - 11, 7^2-4(1)(-11) > 0, two solns
y = -x2 - 8x - 16, -8^2-4(-1)(-16) = 0, one soln
According to the discriminant:
[tex]y = -3x^2 + x + 12[/tex] has two real solutions.[tex]y = 2x^2 - 6x + 5[/tex] has zero real solutions.[tex]y = x^2 + 7x - 11[/tex] has two real solutions.[tex]y = -x^2 - 8x - 16[/tex] has one real solution.The number of real solutions of quadratic equation [tex]y = ax^2 + bx + c[/tex] depends on the discriminant [tex]\Delta = b^2 - 4ac[/tex].
If [tex]\Delta > 0[/tex], the equation has two real solutions.If [tex]\Delta = 0[/tex], the equation has one real solution.If [tex]\Delta < 0[/tex], the equation has zero real solutions.Equation [tex]y = -3x^2 + x + 12[/tex]
The coefficients are: [tex]a = -3, b = 1, c = 12[/tex]The discriminant is: [tex]\Delta = 1^2 - 4(-3)(12) = 145[/tex].Positive, thus two real solutions.Equation [tex]y = 2x^2 - 6x + 5[/tex]
The coefficients are: [tex]a = -2, b = -6, c = 5[/tex]The discriminant is: [tex]\Delta = (-6)^2 - 4(2)(5) = -4[/tex].Positive, thus zero real solutions.Equation [tex]y = x^2 + 7x - 11[/tex]
The coefficients are: [tex]a = 1, b = 7, c = -11[/tex]The discriminant is: [tex]\Delta = (7)^2 - 4(1)(-11) = 93[/tex].Positive, thus two real solutions.Equation [tex]y = -x^2 - 8x - 16[/tex]
The coefficients are: [tex]a = -1, b = -8, c = -16[/tex]The discriminant is: [tex]\Delta = (-8)^2 - 4(-1)(-16) = 0[/tex].Positive, thus one real solutions.A similar problem is given at https://brainly.com/question/19776811
Help on homework! Which of the following can have a negative effect on your credit score?
A. Getting a promotion at work
B. Late payments on a car loan
C. Paying credit card balances in full
D. low debt-to-income ratio
Answers
The answer is - B.
Hope this helps you!
~DL
In how many different ways can the letters of the word china be arranged
Answers
5!= 5*4*3*2*1
5!=120 different options
In sakura’s garden, for every 5 red flowers, there are 10 yellow flowers. There are a total of 75 yellow and red flowers in her garden. How many ref flowers are in Sakura’s garden?
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We have then:
x: number of red flowers
y: number of yellow flowers.
We write the system of equations:
x + y = 75
y = 2x
Solving the system we have:
x = 25
y = 50
Answer:
there are 25 red flowers in Sakura's garden
The equation of a parabola is 1/32 (y−2)2=x−1 .
What are the coordinates of the focus?
(1, 10)
(1, −6)
(−7, 2)
(9, 2)
Answers
The given equation of parabola is
[tex] \frac{1}{32} (y-2)^2 = x-1 [/tex]
Which can also be written as
[tex] x = \frac{1}{32} (y-2)^2 +1 [/tex]
Here vertex (h,k) is (1,2)
And value of a is
[tex] a = \frac{1}{32} [/tex]
Formula of focus is
[tex] (h+ \frac{1}{4a} , k) [/tex]
Substituting the values of h,k and a, we will get
[tex] (1+ \frac{1}{4*(1/32) } , 2} = (1+ 8,2) = (9,2) [/tex]
Therefore the correct option is the last option .
Answer: The correct option is (D) (9, 2).
Step-by-step explanation: We are given to find the co-ordinates of the focus for the following parabola:
[tex]\dfrac{1}{32}(y-2)^2=x-1~~~~~~~~~~~~~~~~~~~~(i)[/tex]
We know that the standard form equation of a parabola is
[tex](y-k)^2=4p(x-h),[/tex]
where the co-ordinates of the focus are (h+p, k).
From equation (i), we have
[tex]\dfrac{1}{32}(y-2)^2=x-1\\\\\\\Rightarrow (y-2)^2=32(x-1)\\\\\Rightarrow (y-2)^2=4\times 8(x-1).[/tex]
Comparing the above equation with the standard form equation of the parabola, we get
h = 1, k = 2, and p = 8.
Therefore, the co-ordinates of the focus are
[tex](h+p,k)=(1+8,2)=(9,2).[/tex]
Thus, option (D) is CORRECT.
please help with this??
Answers
The mode is the number that is repeated more often than any other, so 62 is the mode.
I need Help with this TRIG question
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(15) sin 30.5 = ------ (15)
15
(15) sin 30.5 = x
Plug this part into a calculator.
7.61 = x
Area of a triangle: 1/2bh
1/2 (7.61)(13)
3.805(13)
49.469
49.47 un² is your final answer since you are supposed to round to the tenths place. I hope this helps.
Use the graph below to answer the question that follows:
What is the rate of change between the interval x = π and x = three pi over two?
pi over 16
negative 16 over pi
pi over 4
negative 4 over pi
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(2n + 3)(n – 4) = 0
need help asap!!!
Answers
2n + 3 = 0
2n = - 3
n = - 3 / 2
n - 4 = 0
n = 4
So n = -3/2, 4
**MARKING BRAINLIEST IF RIGHT AND IF YOU SHOW WORK**
3. Use the Fermi process to estimate the number of bricks needed to fill an empty bathtub. Show your work.
My teacher said you can use approximate dimensions of the bricks and bathtub. He said use the easiest ones so that it will be easy to solve.
Answers
brick: 8 x 4 x 2
fermi process:
(60 x 30 x 18) / (8 x 4x 2)
= 32,400 / 64
= 506.25
estimated as 500 bricks