Hello, please consider the following.
a) You need to replace x by -1.

b) You need to replace x by 2t and simplify.

c) You need to replace x by t-2 and develop, and simplify.

Thank you.
Answer:
43
Step-by-step explanation:
Answer: x+8
Step-by-step explanation:
Unit rate is like miles per hour. If John walks 500 miles in 5 hours, the unit rate is 500/5=100 miles per hour.
Answer:
x=0
y=3
Step-by-step explanation:
2(x+3)=2x+6, substituting the first equation in the second
2x+6=2x+6, rearranging the equations
2x-2x=6-6
0=0
y=0+3
y=3