Solve

1- −45÷(−9)=?

2- −72÷(−8)=?

3- −21=0.07z

4- −8−(−2+7)2

which of the following expressions are equivalent to

−44+40?

−4(11−10)

2(−22+10)

none of the above

will give brainliest

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Step-by-step explanation:

1)5

2)9

EXPLANATION FOR NUMBER 3

-21=0.07z

We move all terms to the left

-21-(0.07z)=0

We add all the numbers together, and all the variables

-(+0.07z)-21=0

We get rid of parentheses

-0.07z-21=0

We move all terms containing z to the left, all other terms to the right

-0.07z=21

z=21/-0.07

z=-299+0.07/0.07

4)NEGATIVE 6 (I THINK)

Which of the following expressions are equivalent to  

I THINK IT IS NONE OF THE ABOVE