Round numerical answers to the nearest hundredth, if necessary.

A water bottle rocket is shot upward with an initial velocity of vi = 40 ft/s from the roof of a school, which is at hi = 70 ft above the ground. The equation h = −
1
2
at2 + vit + hi models the rocket's height as a function of time. The acceleration due to gravity a is 32 ft/s2.

50

step-by-step explanation:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

the first option is the answer.