Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given angle. Give exact answers with rational denominators.Find cos A when a = 
and c = 7.
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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When a skydiver jumps from an airplane, his downward velocity V, in feet per second, t seconds into the fall is given by
.
A: Make a graph of V versus t over the first 20 seconds of the fall.B: The terminal velocity of the skydiver is 181 feet per second. What is 90% of terminal velocity?C: When does the skydiver reach 90% of terminal velocity?
?
Round your answer to two decimal places if necessary.
?
What will be an ideal response?
Mathematics
Find the number of proper subsets of the set.{0}
A. 0 B. 2 C. 4 D. 1
Mathematics
Factor.x2 + x - 20
A. (x - 4)(x + 5) B. (x - 5)(x + 4) C. prime D. (x + 1)(x - 20)
Mathematics
Find the sum of the series.
A. 366 B. 38 C. -366 D. 151,716
Mathematics