Real World Quadratic Functions Review

The height of a water balloon that is launched into the air is given by h(t) = -5t² + 40t + 2. From what height was the balloon released?

A frog is sitting on the ground when he is scared by a big dog. His movement is modeled by the equation h = -6t² + 6t where h is the frog's height at any given time, t . How many seconds until the frog is back on the ground?

• 0.5 seconds

• 1 second

• 1.5 seconds

• 2 seconds

• 3 seconds

A ball is thrown into the air from the edge of a 48-foot-high cliff so that it eventually lands on the ground. The graph below shows the height, y, of the ball from the ground after x seconds.

For which interval is the ball's height always decreasing?

• $0\le x\le2.5$

• $0<x<5.5$

• $2.5<x<5.5$

• $x\ge2$

Tags

CCSS.HSF.IF.B.4

KIPP AMP's rectangular playground garden currently has a length and width of 12 and 9 respectively. The length and width will be increased by an equal amount,x and the new area will be 140 sq. ft. What equation would help solve this?

• (12+x)(9+x) = 108

• (x-12)(x-9) = 108

• (12+x)(9+x) = 140

• (x-12)(x-9) = 140

The length of a rectangle is 4 cm more than its width. The area of the rectangle is 96 sq. cm. Find its dimensions.