Question

Evaluate each expression, 11,12,13

Answer 1

For this case we have the following:

a) $\frac{60}{-3}$

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$\frac{60}{- 3} = - 20$

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

Answer 2

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