Can someone me with these questions?

3) a. 16

b. 30

c. 22

4) 1

Step-by-step explanation:

3) To solve this problem you must substitute the values of a and b into each expression, as you can see below:

a.

b.

c.

4) To solve this exercise you must substitute the values of x, y and z into the given expression, as following:

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half

the answer is 48m^2!

step-by-step explanation: