The formula for circumference is 2π r
So solve like this:
c= 2π r
62.8 = 3.14 · r
20 = r (divide 62.8 by 3.14)
Well
It needs to calculate the volume of a rectangular prism (10*20*20) and subtract from it the volume of a half cylinder with a radius of 10 cm and height of 20
as follows:
prism volume = 10*20*20 = 4000 cm^3
half cylinder volume = 0.5 * pi * r^2 * h = 0.5* 3.14 * 10^2 * 20 = 3140 cm^3
Subtract 3140 from 4000, results in: 860 cm^3
I hope that explains what you are stuck in
Answer:
8x - 6
Step-by-step explanation:
5x - 2 - (-3x + 4)
1) Distribute
5x - 2 + 3x -4
2) Combine like terms
8x - 6
Answer:
x = - 5, x = 2
Step-by-step explanation:
Given
x(x + 7) = 4x + 10 ← distribute left side
x² + 7x = 4x + 10 ( subtract 4x + 10 from both sides )
x² + 3x - 10 = 0 ← in standard form
(x + 5)(x - 2) = 0 ← in factored form
Equate each factor to zero and solve for x
x + 5 = 0 ⇒ x = - 5
x - 2 = 0 ⇒ x = 2
