Solve the problem.A truck burns fuel at the rate (gallons per mile) of 
while traveling at x mph. If fuel costs 
per gallon, find the speed that minimizes fuel cost for a 200-mile trip.
A. 45 mph
B. 32.5 mph
C. 56 mph
D. 53 mph
Answer: A
Mathematics
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Use a sum-to-product identity to rewrite the expression.sin 50° - sin 44°
A. 2 cos 47° cos 3° B. 2 cos 47° sin 3° C. -2 sin 47° sin 3° D. 2 sin 47° cos 3°
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Let ? be an acute angle. Find the unknown trigonometric value using the given information.cot ? if tan ? = 0.4146
A. 2.405 B. 2.412 C. 2.419 D. 2.426
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Determine whether the graph is the graph of a function.
A. yes B. no
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Use rational exponents to simplify. Write the answer in radical notation if appropriate.
A. 2x4y4 B. 4x8y8 C. 4x4y4 D. 32x4y4
Mathematics