The diameter of the new rubber ball, to the nearest foot, must be D = 4.0 ft (in the case of the maximum cost).
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How to find the diameter of the ball?</h3>
Remember that for a sphere of diameter D, the surface area is:
A = 4*pi*(D/2)^2
In this case, the cost is $0.02 per square foot, and the company wants to expend (at maximum) $1 per ball, so first we need to solve:
$0.02*A = $1
A = $1/$0.02 = 50
So the surface of the ball must be 50 square feet.
Then we solve:
50ft^2 = 4*3.14*(D/2)^2
D = 2*√(50 ft^2/(4*3.14)) = 4.0 ft
If you want to learn more about spheres, you can read:
brainly.com/question/10171109
Answer:
Each one of the sides is equal to 7d-5
Step-by-step explanation:
A regular pentagon has 5 sides of equal length.
The perimeter of a regular pentagon is given by
P = 5s where s is the side length
35d -25 = 5s
Divide each side by 5
(35d-25)/5 = 5s/5
7d-5 =s
Each one of the sides is equal to 7d-5
Answer:
the first one and the third one, negative three's don't count so don't put those in.
Step-by-step explanation:
-6 ÷ -2 = 3
4 - (-1) = 5
(-1)(-3)= 3
(-2) - 1 = -3
15 ÷ -5 = -3
4÷ 1 = 4
Most likely uncertain because it is a small amount and there are bigger amounts.
Answer:
2400cm²
Step-by-step explanation:
The formula for surface area of a cube is 6a² where a is the length of one side of the cube.
Given a=20 cm the surface area of the cube is ;
6*20²= 6*400=2400cm²
