A ball is thrown from an initial height of 4 feet with an initial upward velocity of 28 ft/s. The ball's height h (in feet) after t seconds is given by the following.
h=4+ 281 – 1612
Find all values of t for which the ball's height is 12 feet.
Round your answer(s) to the nearest hundredth.
(If there is more than one answer, use the "or" button.)

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

(3x-8) or (3x+8)

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