Answer:
7
Step-by-step explanation:
get the x on the same side.
subtract 2x from both sides
30=3x+9
then get the variables on one side by themselves. subtract 9 from both sides.
21=3x
now divide by 3 on both sides.
there's your answer.
I think 4 not sure tell me if I'm right
Answer: (-5,1)
Step-by-step explanation: Explanation in picture.
Answer:
Step-by-step explanation:
10x²+x-2=1/2(5x-2)h
10x²+5x-4x-2=1/2(5x-2)h
5x(2x+1)-2(2x+1)=1/2(5x-2)h
2(2x+1)(5x-2)=(5x-2)h
h=[2(2x+1)(5x-2)]/(5x-2)
h=2(2x+1),5x-2≠0,x≠2/5