4^x=2×2^x=2×7=14
4^x-1=14-1=13
Answer:
y=50x+100
Step-by
I am not really sure i will show you a screenshot
Step by step:
3 2 1
× 6 4
————————————-
+ 1 2 8 4
+ 1 9 2 6 0
————————————-
= 2 0 5 4 4
$2.50+3x=$9.25, if you need to work it out, then you do $9.25-$2.50. You take your answer and divide by three... whatever your solution is, equals X. There you go!