Question

Expand and evaluate the power.

The third power of 2.5.

A.
0.833

B.
5.5

C.
7.5

D.
15.625

Answer 1

i need help

Answer 2

are you allowed to use a calculator ?

Answer 3

\[ 2.5^3 \]
means 2.5*2.5*2.5

many calculators also have a "cube" button (raise to the 3rd power), so you could use that


or you could write 2.5 as 5/2
and do
\[ \frac{5}{2} \cdot \frac{5}{2} \cdot \frac{5}{2} = \frac{125}{8} \]

Answer 4

based on the answer choices, you could also do this:
2 *2 *2 = 8
3*3*3= 27
and we know 2.5 is between 2 and 3
so 2.5*2.5 * 2.5 is between 8 and 27
and we see only 1 of the choices is between 8 and 27