Question

Evaluate each expression, 11,12,13

Answer 1

1. -20
2. 9
3. -25
Hope this helps

Answer 2

For this case we have the following:

a)
`(60)/(-3)`

We look for a number that multiplied by the denominator, resulting in the numerator. When multiplying
`(-20) * (3) = 60`, we get the numerator. Thus, the result is
`(60)/(- 3) = - 20`

b)
`6 - (- 3)`

The law of signs states that:

+ * + = +

+ * - = -

- * + = -

- * - = +

According to the fourth case we have to:

`6 - (- 3) = 6 + 3 = 9`

c)
`(- 5) ^ 2 = (- 5) (- 5) = 25`

For this case we apply the fourth case of the law of signs mentioned above. By power properties:

`(a) ^ 2 = (a) (a)`

Answer:

Part a: -20

Part b: 9

Part c: 25