A(4-a)-5(a+7) is equivalent to?

removing of bracket

Step-by-step explanation:

a(4-a)-5(a+7)

4a-a square - 5a-35

4a-5a-a - a square - 35

-a square - a - 35

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

the first one

step-by-step explanation:

just id the test.