The braking distance, y feet, for Damon's car to come to a complete stop is modeled by `y = (3(x^(2) + 10x))/(40)`, where x is the speed of the car in miles per hour. According to this model, which of the following is the maximum speed, in miles per hour, Damon can be driving so that the braking distance is less than or equal to 150 feet?

For a new car, the gas mileage in terms of its speed x is modeled by the function G(x)=-1/28x^2+3x-31 , where 15 le x le 90 , and x is speed in miles per hour and G is miles per gallon. At what speed, in miles per hour, does the car attain its best gas mileage ?

A car travelling at a speed of 30 km per hour is brought to rest in 8 metres by applying brakes. If the same car is travelling at 60 km per hour, it can be brought tor est with the same braking force at a distance of

A man can row at a speed of x km/hr in still water. If in a stream which is flowing at a speed of y km/hr it takes him z hours to row to a place and back, then what is the distance between the two places ?

The speed, in miles per hour, of a particular experimental spacecraft t minutes after it is lauched is modeled by the function M, which is defined as M(t)=200(3)^((t)/(3)) . According to this model, what is the speed, in miles per hour, 9 minutes after the spacecraft is lauched?

Waugh jogged to a restaurent at x miles per hour, and jogged back home along the same route at y miles per hour. He took 30 minutes for the whole trip. If the restaurant is 2 miles form home along the route he too, what is the average speed in miles per hour at which he jogged for the whole trip ?

The distance between cities A and B car travels from A to B at 60 miles per hour and returns from B to A long the same route at 40 miles per hour. What is the averge speed for the round trip?

A family planning a weekend trip decides to spend no more than a total of 8 hours driving. By leaving early in the morning, they can average 40 miles per hour on the way to their destination. Due to the heavy Sunday traffic they average only 30 miles per hour on the return trip. What is the farthest distance from home the can plan to go? 120 miles or less Between 120 and 140 miles 140 miles Between 140 and160 miles

The distance traveled by Earth in one orbit around the Sun is about 580,000,000 miles. Earth makes one complete orbit around the Sun in one year. Of the following, which is closest to the average speed of Earth, in miles per hour, as it orbits the Sun?

Jessica's car gets 18 miles per gallon when the car travels at an average speed of 35 miles per hour. Jessica begins a trip with 14 gallons of gas, and she travels at 35 miles per hour for the first 4 hours of her trip. Which of the following functions g is the most accurate model for the number of gallons of gallons of gas remaining in the tank t hours after the trip begins for 0le t le4 ?

A cyclist maintains a constant speed on his bicycle . The graph above shows the number of miles he covers in x hours . Two points on the graph are (2,10) and (3,15). What is the cyclist's speed in miles per hour ?