Question

Evaluate 80 × a-2 for a = 4.

20

5

one-twentieth


one-fifth

Answer 1

@wiseman905

Answer 2

Substitute 4 for a.

Answer 3

80 * 4^-2

Answer 4

Substitute 4 for a.
80 * 4^-2

Answer 5

Do you know how to simplify 4^-2?

Answer 6

you multiple 4 and -2

Answer 7

Yea!

Answer 8

Is the -2 an exponent?

Answer 9

don't you do negative 4 times negative 4

Answer 10

No, if it is an exponent, then to make it positive you make it a fraction. 1/4^2 or 1/16

Answer 11

so it will be 1/20

Answer 12

80*1/16 = 5

Answer 13

1/5 then

Answer 14

do you keep the sum a fraction

Answer 15

You can, but 5/1 is usually simplified to 5.