Solve.The product of a number and -9 amounts to five times the sum of that number and 28. Find the number.
A. -9
B. 10
C. -10
D. 9
Answer: C
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Find the derivative of y with respect to x, t, or ?, as appropriate.y = ln (x - 5)
A. 
B. 
C. - 
D. 
Solve the problem.A certain product has supply and demand functions given by p = 4q + 29 and p = 254 - 11q, respectively, where p is the price in dollars and q is the quantity supplied or demanded at price p. How many units are supplied and demanded at market equilibrium?
A. 18 units B. 15 units C. 89 units D. 20 units
Solve the problem.A piece of equipment was purchased by a company for $10,000 and is assumed to have a salvage value of $3,000 in 10 years. If its value is depreciated linearly from $10,000 to $3,000, find a linear equation in the form V = mt + b, t time in years, that will give the salvage value at any time t, 
A. T = - 700V + 10,000 B. V = - 700t + 10,000 C. V = - 700t - 10,000 D. V = 700t + 10,000
Solve the problem.An airplane flies 400 miles with the wind and 320 against the wind in the same length of time. If the speed of the wind is 40, what is the speed of the airplane in still air?
A. 350 mph B. 160 mph C. 360 mph D. 365 mph