the height in feet of an arrow is modeled by the equation h(t)=(1+2t)(18-8t), where t is seconds after the arrow is shot. when does the arrow hit the ground? explain or show your reasoning.

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

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation: