Question

Please help me, i'm not good in Math so if anyone can help that'd be great!
1) Is -7 + 9 = -9 + 7 true, false or open?
2) Is 4x - 3 = 19 true false or open?
3) Which of the following is a solution to the equation 16 = 4x -4?
A. -5
B. -4
C. 5
D. 16
4) Use mental math to determine the solution to x - 3 =10.
A. X = 7
B. X = 13
C. X = 30
D. X = 0
PLEASE HELP NOT ASKING FOR MUCH. :(

Answer 1

1).false because one equals 2 and the other equals-2
2).x=5.5
3).c
4).b

Answer 2

Thank you so much!!

Answer 3

you welcome