Simplify.15 + 11 ? 30
A. 195
B. 345
C. 780
D. 56
Answer: B
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Solve the problem.In 1880 the population of a midwest city was 19,000. By 1920 it had grown to 20,000. If it continues to grow at the same rate, what will the population be in 1939? Give your answer to the nearest whole number.
A. 20,475 B. 19,476 C. 21,000 D. 20,000
Solve the problem.A 20-kg mass is attached to a spring that hangs vertically and is stretched 3 m from the equilibrium position of the spring. Assume a linear spring with F(x) = kx. How much work is required to stretch the spring and lower the mass 1 m? Round to four decimal places when appropriate.
A. 16.3333 J B. 424.6667 J C. 228.6667 J D. 212.3333 J
Provide an appropriate response.The solution set of the system y1 = 2x + 3 and y2 = -x + 9 is {(2, 7)}. Using slopes and y-intercepts, determine which of the two calculator-generated screens, left or right, is the appropriate one for this system.
A. Left B. Right C. Neither is correct. D. Both could be correct.
Factor completely. If the polynomial cannot be factored, write "prime."9y4 - 49
A. (3y2 - 7)2 B. (3y2 + 7)2 C. (9y2 + 1)(y2 - 49) D. (3y2 + 7)(3y2 - 7)