Cab A charged $5x + 20 for a ride to the

airport from the mall and Cab B charged

$4x + 50 for the same ride. Which cab

charged more? How much more?

Cab B charged more

It charged $ (30-x) more

Step-by-step explanation:

Here, we want to know which of two cabs charged more for a ride from the airport to the mall.

To know the cab that charged more, we shall be substituting any same value of x in both of the fees

Let's say x is 10

Thus 5x + 20 becomes 5 (10) + 20 = 50 + 20 = 70

while 4x + 50 becomes 4 (10) + 50 = 40 + 50 = 90

Clearly we can see that 4x + 50 is greater then 5x + 20, so we can conclude that 4x + 50 is a greater fee

Now since we know the one that's higher, we can now know the value by which it is higher

That would be (4x + 50) - (5x + 20)

= 4x + 50 - 5x - 20

= 4x-5x + 50-20

= - x + 30 or simply 30-x