Of 140 seventh-grade students, 15% earn the Presidential Physical Fitness Award. How many students earn the award?

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Answer 1

Answer: (15/100) x 140 =21

percentage is always over 100, thus since it's 15%, it becomes 15/100

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James started tutoring children several times a week. The first 2 weeks he had to purchase tutoring supplies and had losses of $40 and $65. The next 3 weeks he made a profit of $105, $70, and $140. At the end of the 6 weeks, he had a net profit of $252.1. Write an equation to find the profit or loss for the 6th week in this situation. 2. Solve your equation. 3. Was there a profit or a loss for that week? 4. What was James's average profit or loss for the 6 weeks?
What is -4+(-2)= I have no clue what i’m doing
Can u help me for 10 points!!!
1/4 divided by 2/7 ( symplify) ?

A jar contains 4 red marbles, numbered 1 to 4, and 11 blue marbles numbered 1 to 11. A marble is chosen at random. If you're told the marble is red, what is the probability that it has the number 2 on it?

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Answer:

25%

Step-by-step explanation:

So there are four marbles that are red.

It doesnt matter if we have a probability of picking blue because the question says you are picking red.

There are four possible outcomes and one favorable outcome so it is 1/4 of 25/100 or 25%

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How many milliliters of a 15% saline solution and how many milliliters of a 40% saline solution must be mixed to produce 10 milliliters of a 30% saline solution?Volume of 15% solution= ____
Volume of 40% solution = ____

Answers

x - volume of 15% saline solution. Theres is 15% x = 0,15 x saline solution
y - volume of 40% saline solution. There is 40% y = 0,4y saline solution

You want to produce 10 mililiers so x+y= 10

And this saline has to be 30%, so you've got 30 % * 10 = 0,3 * 10 = 3 ml saline. So:
0,15x + 0,4y = 3
And you've got system of equations:
$\begin{cases} x+y=10 \n 0,15x+0,4y=3\end{cases} \n \begin{cases} x=10-y \n 0,15x+0,4y=3\end{cases} \n \hbox{Substitute value from first equation to second:} \n 0,15(10-y)+0,4y=3 \n 1,5-0,15y+0,4y=3 \n 0,25y=1,5 \qquad /:0,25 \n y=(1,5)/(0,25)=(150)/(25)=6 \n \hbox{Then:} \n x=10-y=10-6=4$

So answer:
Volume of 15% saline solution : 4 mililiters
Volume of 40% saline solution: 6 mililiters.

The graph below represents which system of inequalities?graph of two infinite lines that intersect at a point. One line is dashed and goes through the points 0, 2, negative 2, 0 and is shaded in below the line. The other line is dashed, and goes through the points 0, 6, 3, 0 and is shaded in below the line.

A y < −2x + 6
y < x + 2

B y ≤ −2x + 6
y ≤ x + 2

C y < 2 over 3x − 2
y > 2x + 2

D None of the above

Answers

The graph below represents y < 2 over 3x − 2 | y > 2x + 2 system of inequalities. The answer is letter C. The rest of the choices do not answer teh qustion above

If a plant manufacturing carpet backing has a cylindrical tank that is 3 meters high and is 6 meters in diameter, what is the volume of the tank? Assume 3.14 for pi.A)28.3 m^3
B)37.7 m^3
C)56.5 m^3
D)84.8 m^3

Answers

V = 3.14(r^2)h
V = 3.14(3)^2(3)
V = 3.14(9)(3)
V = 3.14(27)
V = 84.78 m^3
V = 84.8 m^3

The answer is D.

You went to the mall with $80 you spend 25% of your money on a pair of shorts and 65% of the remainder on sandels how much did you spend on the sandels.