Second step
PEMDAS
Parenthesis exponents division addition subtraction
10% of $20 is 2 so the shirt would be $18 before tax
Answer:

Step-by-step explanation:
System of equations:


_____________
simplify:(isolate x)



substitute equation for x into second equation:

simplify:

substitute y into equation for x:

Answer:
4
Step-by-step explanation:
it takes 15 mins to do 1 mile (3 times 5) and 60 mins divided by 15 would be 4 . so 4 miles