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Eduardwww [97]
3 years ago
15

A set of pens sells for $6.25 and costs $3.50 to make. Forty-two percent of the profit (the difference between the purchase pric

e and the amount it costs to make) from each set of pencils goes to a school. If 520 sets are sold, what is the amount of money that will go to the school?
Mathematics
1 answer:
Sergeeva-Olga [200]3 years ago
4 0

Answer:

$1430

Step-by-step explanation:

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Each face of a cube is a square with a side length of 3 meters. What is the total area of all the faces of the cube?
Stells [14]

Answer:

I am pretty sure it is 9

Step-by-step explanation:

Since a cube has the same with and length on every side is the same so I just do 3x3=9

3 0
3 years ago
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8 0
3 years ago
A sphere has diameter 28 cm. If the diameter is divided by 2, what is the effect on the surface area?
spayn [35]

Answer:

The surface area is divided by 4.

Step-by-step explanation:

Surface area of a sphere is 4πr².

When the diameter is 28 the radius is 14. So: 4π(14)² = 784π

If you cut the diameter in half you get 14. The radius is now 7.

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4 0
3 years ago
What is the solution to the rational equation x over 2x plus 1 minus 1 over 4 equals 2 over 2x plus 1
aalyn [17]
We want to solve
\frac{x}{2x+1} - \frac{1}{4} = \frac{2}{2x+1}

Subtract 2/(2x+1) from each side.
\frac{x}{2x+1} - \frac{2}{2x+1y} - \frac{1}{4} = 0

Add 1/4 to each side, and simplify the left side.
\frac{x-2}{2x+1} = \frac{1}{4}

Cross multiply.
4(x - 2) = 1(2x + 1)
4x - 8 = 2x + 1

Simplify and solve for x.
4x - 2x = 1 + 8
2x = 9
x = 9/2   or x = 4 1/2.

Answer:  x =  \frac{9}{2} \,\, or \,\, x = 4 \frac{1}{2}

5 0
3 years ago
Identify the inverse of f(x)=x^2-9
Reika [66]
A
x=y^2-9
x+9=y^2
square root both sides
+-sqrt(x+9)
7 0
2 years ago
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