QUADRATIC FORMULA: You are throwing a football on the field. The path of the ball modeled by the equation h(t) = -.51(t+1.02)(t-87) where h is the height above the ground in feet and time in seconds after the ball is thrown. Answer these questions : How high does the ball travel? How long does it take the ball to hit the ground? How high above the ground is the ball when you throw it? Your friend catches the ball when it is 3.2 feet in the air. How long after you throw the ball does your friend catch it?

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b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

1. perpendicular

2. parallel

3. perpendicular