Question

Evaluate 27 x a^-2 for a =3.

Answer 1

Any ideas?

Answer 2

evaluating a variable expression means what to you @ImNotGoodAtMath ?

Answer 3

\(\normalsize\color{black}{ 27 \times a^{-2} }\). When they say that a=3, plug in 3 instead of a.

\(\normalsize\color{black}{ 27 \times 3^{-2} }\) Now solve it,

\(\normalsize\color{black}{ 27 \times 3^{-2} =3^3 \times 3^{-2}=3^{3+-2}=3^? }\)

Answer 4

7^2?

Answer 5

Where do you get the ` 7 ` from ?!