Gary exercises 1.75 hours on Mondays, Wednesdays, and Saturdays. How many weeks will it take Gary to exercise a total of 21 hours?

What equation models the problem?

How many weeks will it take Gary to exercise a total of 21 hours?

 The equation is 5.25x = 21  and it will take Gary 4 weeks to exercise 21 hours.

Step-by-step explanation:

So we know a week is  7 days and Gary exercise 3 days out of the 7 days.

so we will have to multiply 3 * 1.75 to find the number of hours that  she exercise in 1 week.

3 * 1.75 = 5.25  so Gary exercises  5.25 for every week  so now we could use x to represent the number of weeks Gary will take to exercise 21 hours.

5.25x = 21  where x is the number of weeks.

x= 4

let y equal to

the total fare and x is the mile of taxi ride. so the equation is

y = 0.55x + 1.75

since susie has

$10 to spend for a taxi cab, so he can have

10 = 0.55x +

1.75

x = 15 miles of

taxi ride

so the system of

inequality is

10 < 0.55x +

1.75

x > 2

when the daily mileage is greater than 40 miles, unlimited mileage plan will save you money. 40 miles is the break-even point.

step-by-step explanation: