Real-World Quadratic Problems: Apply the Formula

A ball is thrown upwards from a height of 2 meters with an initial velocity of 10 meters per second. The height of the ball after t seconds is given by the equation h(t) = -5t^2 + 10t + 2. How long will it take for the ball to hit the ground?

• 4.20 seconds

• 5.00 seconds

• 3.74 seconds

• 2.50 seconds

A rectangular garden has a length that is 3 meters longer than its width. If the area of the garden is 70 square meters, what are the dimensions of the garden?

• Width: 8 meters, Length: 11 meters

• Width: 6 meters, Length: 9 meters

• Width: 7 meters, Length: 10 meters

• Width: 5 meters, Length: 8 meters

A company finds that the profit P (in dollars) from selling x items is given by the equation P(x) = -2x^2 + 40x - 100. How many items should the company sell to maximize its profit?

• 10

• 20

• 15

• 5

The path of a projectile is modeled by the equation h(t) = -4.9t^2 + 20t + 5, where h is the height in meters and t is the time in seconds. At what time will the projectile reach its maximum height?

• 2.04 seconds

• 1.50 seconds

• 4.10 seconds

• 3.00 seconds

A car's distance from a starting point is modeled by the equation d(t) = 3t^2 - 12t + 15, where d is the distance in meters and t is the time in seconds. When will the car be at rest?

• 3 seconds

• 4 seconds

• 1 second

• 2 seconds

A rectangular swimming pool has a length that is 4 meters longer than its width. If the area of the pool is 96 square meters, what are the dimensions of the pool?

• Width: 10 meters, Length: 14 meters

• Width: 5 meters, Length: 9 meters

• Width: 8 meters, Length: 12 meters

• Width: 6 meters, Length: 10 meters

The height of a water fountain is modeled by the equation h(t) = -3t^2 + 12t + 1. How long will it take for the fountain to reach a height of 10 meters?

• 1 second and 5 seconds

• 0 seconds and 5 seconds

• 2 seconds and 4 seconds

• 1 seconds and 3 seconds

A farmer wants to create a rectangular field with a perimeter of 100 meters. If the length is 5 meters more than the width, what are the dimensions of the field?

• Width: 22.5 meters, Length: 27.5 meters

• Width: 25 meters, Length: 30 meters

• Width: 15 meters, Length: 20 meters

• Width: 20 meters, Length: 30 meters

A toy rocket is launched from a height of 1 meter with an initial velocity of 15 meters per second. The height of the rocket after t seconds is given by the equation h(t) = -4.9t^2 + 15t + 1. When will the rocket reach its maximum height?

• 1.53 seconds

• 1.25 seconds

• 1.75 seconds

• 2.00 seconds

A rectangular plot of land has a length that is twice its width. If the area of the plot is 200 square meters, what are the dimensions of the plot?

• Width: 10 meters, Length: 20 meters

• Width: 5 meters, Length: 15 meters

• Width: 12 meters, Length: 24 meters

• Width: 8 meters, Length: 16 meters