Solve the problem.A ball is launched vertically with an initial velocity of 160 feet per second. The function 
describes the height of the ball above the ground, s(t), in feet, t seconds after the launch. What is the instantaneous speed of the ball when it hits the ground?
A. -320
B. 160
C. -160
D. 320
Answer: C
Mathematics
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Graph.
- 
= 1
A. 
B. 
C. 
D. 
Mathematics
Find the unit vector that has the same direction as the vector v.v = -5i - 12j
A. u = -65i - 156j
B. u = - 
i - 
j
C. u = - 
i - 
j
D. u = 
i + 
j
Mathematics
Perform the indicated operations. Express the result in polar form.
- 
A. 
B. 
C. 
D. 
Mathematics
Estimate the product.28.4 × 2.7
A. 90 B. 80 C. 77 D. 9
Mathematics