Question

Which expression is equivalent to -20 + (-50) + (-90)? A. -20 - (-50) - (-90) B. -20 - (-50) + (-90)C. -(20 + 50) + (-90) D. -20 + (-50) - (-90)

Answer 1

ANSWER

Option C is the correct option

EXPLANATION

To find which of the expressions is equivalent. We have to expand the brackets in each of he expressions and find the answer.

We must remember that:

+ * + = +

+ * - = -

- * + = -

- * - = +

For the expression given:

-20 +(-50) + (-90)

= -20 - 50 - 90

= -160

OPTION A

-20 -(-50) - (-90)

= -20 + 50 + 90

= 120

OPTION B

-20 - (-50) + (-90)

= -20 + 50 - 90

= -60

OPTION C

-(20 + 50) + (-90)

= -20 - 50 - 90

= -160

As we can already see, Option C is the correct option.