On a map of the United States, 24 cm represents 18 miles. How many centimeters represent 1 mile?

1.33333333333 cm

Step-by-step explanation:

It's pretty simple:

Based on the question, we know that 24cm = 18 miles

Therefore we can do a three simple rule

If 24 cm = 18 miles

   x cm =  1 mile

x =

x =

a and c

for infinitely many solutions we require both left and right sides to be equal

distribute and simplify

a

14 - 8x = 20 - 8x - 6 = 14 - 8x ← both sides equal so infinite solutions

b

6x - 54 = 6x - 54 + x = 7x - 54 ← not equal

c

4x + 16 = 4x + 10 + 6 = 4x + 16 ← both sides equal so infinite solutions

d

5x - 40 + 10 = 5x + 10

5x - 30 = 5x + 10 ← not equal

well, because the $0.25 is an added cost depending on how many minutes, the answer would be y = 30 + 0.25x.