You did not put a picture
a. A=7560(t)+5550
work: 45 × 24 × 7 =7650
b. t=12.5
100,000=7650(t)+5500 (subtract)
94450=7650(t) (divide)
12.493386243 (round)
12.5
Is it multiplication? subtraction? division? addition?
As 6 and 8 can be divided by 2 at the same time, so the simple fraction for 6/8 is 3/4. that's how much he walked.
5n-2=n+18
Move n to the other side
Sign changes from +n to -n
5n-n-2= n-n+18
5n-n-2= 18
4n-2= 18
Move -2 to the other side
Sign changes from -2 to +2
4n-2+2= 18+2
4n= 18+2
4n= 20
Divide by 4 for both sides
4n/4= 20/4
Answer: n=5