Use a product-to-sum identity to rewrite the expression.sin 42° sin 52°
A. 0.5(cos(-10°) - cos 94°)
B. 0.5(cos 94° + cos(-10°))
C. 0.5(sin 94° + sin(-10°))
D. 0.5(sin(-10°) - sin 94°)
Answer: A
Mathematics
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A. 36° B. 54° C. 72° D. 108°
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Find the vertex of the given parabola.f(x) = x2 + 5
A. (0, -5) B. (5, 0) C. (-5, 0) D. (0, 5)
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Solve the problem.The pH scale is used by chemists to measure the acidity of a solution. It is a base 10 logarithmic scale. The pH, P, of a solution is defined as 
where H = [H3O+] is the hydronium ion concentration in moles per liter. Find the rate of change 
.
A. 
= - 
B. 
= - 
C. 
= - 
D. 
= - 
Mathematics