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

Option C is the correct option

Step-by-step 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.