Find the length of the third side of the right triangle. Assume that c represents the length of the hypotenuse. Give an exact answer and, if appropriate, an approximation to three decimal places.b = 4, c = 8
A. a = 
; a ? 3.464
B. a = 4
C. a = 
; a ? 5.657
D. a = 
; a ? 6.928
Answer: D
Mathematics
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Solve the system by graphing. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. infinitely many solutions; {
x = 7} or {
x = -6}
B. {(-6, 7)}
C. no solution; ?
D. {(7, -6)}
Mathematics
Multiply.(3 - 
)(5 - 
)
A. 15 - 7x
B. 15 - 7
C. 15 - 8
+ x
D. 15 - 8
- x
Mathematics
Use integration by parts to establish a reduction formula for the integral.
A. 
= - 2xn-1 e- x2 - 2(n - 1) 
B. 
= n xn-1 e- x2 + 2n 
C. 
= - 
xn e- x2 + 
D. 
= - 
xn-1 e- x2 + 
Mathematics
Solve the equation.16t3 - 81t = 0
A. {0}
B. 
C. 
D. 
Mathematics