Express the English phrase using an algebraic expression.Seven times the sum of a number and -3
A. 7x - (-3)
B. 7+ x + (-3)
C. 7x + (-3)
D. 7(x + (-3))
Answer: D
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The function 
satisfies the equation of change 
. For what values of f is the graph of f versus x decreasing?
?
A. 
B. 
C. 
D. 
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
Solve the problem. Round your answer to the nearest tenth of a percent, if necessary.3.8 is what percent of 21?
A. 0.2% B. 5.5% C. 552.6% D. 18.1%
Evaluate the expression when x = 5, y = -2, and t = 8.x - y
A. 3 B. -3 C. -7 D. 7