Question

One fifth of a number n is equal -7 write equation and  true false or open sentence

Answer 1

1/5n=-7
Multiply both sides by 5 to get rid of the fraction.
n=-35

Answer 2

One fifth of a number n is equal -7 as an equation would look like this:

1/5 n = -7          / * 5 (both sides)
n = -35

So if number n equals -35, then it's true that 1/5n equals -7.