Factor the trinomial completely.15z2 - 8z - 16
A. (15z - 4)(z + 4)
B. (3z + 4)(5z - 4)
C. (3z - 4)(5z + 4)
D. (15z - 4)(z - 16)
Answer: C
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Find the exact value of the expression.cot 
A. 
B. 
- 1
C. 2 + 
D. 2 - 
Solve the problem.A tank contains 2
gallons of water. Its capacity is 
How much more water is needed to fill it?
A. 
gal
B. 
gal
C. 1
gal
D. 4
gal
Determine the real solutions to the system of nonlinear equations.y2 + 3x2 = 37y2 - x2 = 1
A. (3, 
), (3, -
)
B. (3, 
), (3, -
), (-3, 
), (-3, -
)
C. (4, 
), (4, -
)
D. (4, 
), (4, -
), (-4, 
), (-4, -
)
Solve the problem.The loudness of a sound is measured in decibels (dB). The loudness L of a sound is related to its intensity I by the equation 
where I0 = 10-12 watts per square meter (W/m2) is the intensity of the faintest sound the human ear can detect. Find the intensity of a 45 dB sound.
A. I = 10-7.5 W/m2 B. I = -7.510 W/m2 C. I = 10438 W/m2 D. I = 1016.5 W/m2