Question

evaluate 0.53n+5 when n=3 and when n=-3

Answer 1

0.53(3)+5 = 1.59 + 5 = 6.59 when n = 3
0.53(-3)+5 = -1.59 + 5 = 3.41 when n = -3

Answer 2

Simple...

you have: 0.53n+5

n=3

and 

n=-3

When n=3-->>

0.53(3)+5

1.59+5=6.59

When n=-3...

0.53(-3)+5

-1.59+5=3.41

Thus, your answer.