Answer:
A = pi * r^2 = pi * 5^2 = 25*pi = 78.54 in²
Answer:
x = 7.8
Step-by-step explanation:
a^2 + b^2 = c^2
4^2 + 2^2 = c^2
16 + 4 = c^2
c^2 = 20
c = 4.5
a^2 + b^2 = c^2
a^2 + 4.5^2 = 9^2
a^2 + 20.25 = 81
a^2 = 81 - 20.25
a^2 = 60.75
a = 7.8
Answer:
<h2>x = 2</h2>
Step-by-step explanation:
We know that 5 times x has to be greater than 9, since the equation's outcome is not negative. We know that 1 + 9 = 10, so 5 times x must equal 10.
5 x 2 = 10
5 x 2 - 9 = 1
Therefore, x = 2