Determine whether the given value is a solution to the equation.19 = x2 - 2x - 5, x = 6
A. Yes
B. No
Answer: A
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The life expectancy E, in solar lifetimes, of certain stars depends on their mass M, in solar masses. The relationship is
.
As mass increases, life expectancy decreases. What can you say about the rate of decrease? A graph of E versus M can help you answer this question.
?
A. Life expectancy decreases at a decreasing rate. B. Life expectancy decreases at an increasing rate. C. Life expectancy reaches a point of inflection. D. None of the above.
Solve the problem.For a charter flight, an airline charges a fare of $200 per person plus $4 per person for each unsold seat on the plane. If the plane holds 100 passengers and if x represents the number of unsold seats, find an expression for the total revenue received for the flight and find the maximum revenue.[Hint: To find an expression for the total revenue, multiply the number of people flying, 
by the price per ticket.]
A. R(x) = (100 - x)(200 + x) maximum revenue: $22,500 B. R(x) = (100 - x)(200 + 4x) maximum revenue: $22,500 C. R(x) = 204(100 - x) maximum revenue: $20,400 D. R(x) = (100 - x)(200 + 4x) maximum revenue: $18,000
Let U = {q, r, s, t, u, v, w, x, y, z}, A = {q, s, u, w, y}, B = {q, s, y, z}, and C = {v, w, x, y, z}. List the elements in the following set.A ? (B ? C)
A. {q, w, y} B. {q, r, w, y, z} C. {q, y, z} D. {q, s, u, w, y, z}
Solve for y.2x = 9y - 8
A. y = 
B. y = 17 + 2x
C. y = 
D. y = 17 - 2x