Subtract.-15 - (-6)
A. 21
B. -21
C. 9
D. -9
Answer: D
Mathematics
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Solve the problem.The total solar radiation H (in W/m2) on a certain surface during an average clear day is given by H = 
(-6 < t < 6),where t is the number of hours from noon. Find the derivative of H with respect to t.
A. 
= - 
B. 
= - 
C. 
= 
D. 
= - 
Mathematics
Determine the real solutions to the system of nonlinear equations.xy = 16x2 + y2 = 68
A. (2, 8), (8, 2), (2, -8), (8, -2) B. (-2, -8), (-8, -2), (-2, 8), (-8, 2) C. (2, 8), (-2, -8), (2, -8), (-2, 8) D. (2, -2), (-2, -8), (8, 2), (-8, -2)
Mathematics
Find the measure of the unknown angle in the pair of supplementary angles.Find the measure of ?s if the measure of ?t = 116°.
A. 64° B. 116° C. 2° D. 296°
Mathematics
Combine.18 + (-17) - 1 - (-8)
A. -8 B. 28 C. 8 D. -6
Mathematics