Aball is thrown upward from the top of a building. the function below shows the height of the ball in relation to sea level, ft, in feet, at different times t in seconds: f(t) = -16t2 + 48t + 100 the average rate of change of f(t) from t = 3 seconds to t = 5 seconds is feet per second.

average rate of change is the slope (of the line) between the two coordinates

f(t) = -16t² + 48t + 100

f(3) = -16(3)² + 48(3) + 100   = -144 + 144 + 100   = 100            (3, 100)

f(5) = -16(5)² + 48(5) + 100   = -400 + 240 + 100 = -60            (5, -60)

m = = = = -80

-80 ft/sec

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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