Solve the problem.A projectile is fired vertically upward into the air, and its position (in meters) above the ground after t seconds is given by the function s(t) = -4.9t2 + 30t.a. Find the instantaneous velocity function v (t).b. Determine the instantaneous velocity of the projectile at t = 1 and t = 2 seconds.
A. a. v(t) = -9.8t + 30; b. v(1) = 20.2 m/s, v(2) = 10.4 m/s
B. a. v(t) = 20.2t; b. v(1) = -20.2 m/s, v(2) = -40.4 m/s
C. a. v(t) = 20.2t; b. v(1) = 20.2 m/s, v(2) = 40.4 m/s
D. a. v(t) = -9.8t + 30; b. v(1) = -20.2 m/s, v(2) = -10.4 m/s
Answer: A
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then how fast are the people moving when they are 
from the right angle? (Round your answer to two decimal places.)
A. 5.00 m/s B. 2.00 m/s C. 0.50 m/s D. 1.00 m/s
Solve the given applied problems involving variation.The crushing load of a square wooden post varies directly as the fourth power of its thickness and inversely as the square of its length. If a post src="https://sciemce.com/media/4/ppg__text0424191335__f1q22g5.jpg" alt="" style="vertical-align: -4.0px;" /> high?
A. 500 tons
B. 4000 tons
C. 10 tons
D. 900,000 tons
thick and 
high is crushed by a load of 
what is the crushing load of a post 
thick and
Graph the equation and give the coordinates of the vertex.y = x2 - 2x - 4 
A. (-1, -5)
B. (1, 3)
C. (1, -5)
D. (-1, -3)
Find the degree of the polynomial function.g(x) = -11x8 - 9
A. -11 B. 8 C. 9 D. 0