Question

Evaluate –x + 3.9 for x = –7.2.

A. –3.3

B. –11.1

C. 11.1

D. 3.3

Answer 1

C because since X in the equation is negative the negative value for x will cancel and 7.2 becomes positive. there fore 7.2+3.9=11.1

Answer 2

11.1

C is the correct option.

Explanation:

We have been given the equation
`-x+3.9` and we have to evaluate this expression for
`x=-7.2`

In order to find the same, we can substitute x = -7.2 in the expression

`-(-7.2)+3.9`

Now, we know the rule (-)(-)=+

`7.2+3.9`

On adding, the numbers, we get

`=11.1`

Hence, the value of the expression at x = -7.2 is 11.1

C is the correct option.