Ihad a hard time understanding these questions. can anyone ?

7.) it's A because if you flip over (0,3) over the y-axis it stays at the y-axis because it is on it XD hope that wasn't too confusing lol

8.) 2/3 x +5 = 1
isolate x
2/3 x + 5 = 1
subtract 5 from both sides
2/3 x = -4
multiply both sides by 3
2x = -12
divide both sides by 2
x = -6
A.) x = -6

9.) Use the given equation and plug in 11 for x
y = 100 - 8.9x
y = 100 - 8.9(11)
y = 100 - 97.9
y = 2.1
B.) 2.1%

10.) 5c + 4 = 2(c-5)
multiply 
5c + 4 = 2c - 10
add 10 to both sides
5c + 14 = 2c
subtract 5c from both sides
14 = -3c
divide both sides by -3
-4 2/3 = c
A.) c = -4  2/3

11.)  you have to find the graph that suits the slope 2.5/1 starting at (0, 0)
That is Graph D

12.) The answer for this one is C.) The ordered pairs do not represent a function because one input value has two different output values.

Hope this helps

Didn't think I was gonna do them all, but here they are XD

21 is the answer the answer is 21