Question

HELP PLEASE.

Which expressions, when evaluated with z = 8, are negative in value?



Choose ALL answers that are correct.



A. –2z – 14


B. –25 + 4z


C. –2z + 15


D. 30 – 3z

Answer 1

Let's do the first option first.

-2z - 14

Plug in z = 8:

-2(8) - 14

Multiply:

-16 - 14

Subtract:

-30

So Option 1 is correct.

Option 2:

-25 + 4z

Plug in z = 8:

-25 + 4(8)

Multiply:

-25 + 32

Add:

7

So Option 2 is incorrect.

Option 3:

-2z + 15

Plug in z = 8:

-2(8) + 15

Multiply:

-16 + 15

Add:

-1

So Option 3 is also correct.

Option 4:

30 - 3z

Plug in z = 8:

30 - 3(8)

Multiply:

30 - 24

Subtract:

6

So Option D is incorrect.

Answer 2

Welcome to Open Study!

You can give medals by clicking 'Best Response'. @OpiGeode

Answer 3

I am not new to OpenStudy, and I already knew how to do that, thanks..

Answer 4

Lol, it's hard to tell because OS is messed up.

Answer 5

also A is correct because -2*8=-16-14=-30

Answer 6

A and C are correct I took the assessment

Answer 7

Thanks but I asked this question 9+ days ago. I already took the test.