Write the phrase as a variable expression. Use x to represent "a number."Twice a number, decreased by 25
A. 2x - 25
B. 2 + x - 25
C. 2(x - 25)
D. x - 50
Answer: A
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Solve the problem.In a Psychology class, the students were tested at the end of the course on a final exam. Then they were retested with an equivalent test at subsequent time intervals. Their average scores after t months are given in the table.
Using a graphing utility, fit a logarithmic function y = a + b ln x to the data. Using the function you found, estimate how long will it take for the test scores to fall below 84%. Express your answer to the nearest month.
A. 20 months B. 10 months C. 8 months D. 12 months
Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.A barge takes 2 hours to move (at a constant rate) downstream for 16 miles, helped by a current of 3 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 8 hr B. 2 hr C. 32 hr D. 5 hr
Find the vertices and foci of the given ellipse.5x2 + 10y2 = 50
A. Vertices: (10, 0) and (-10, 0);
Foci: (5, 0) and (-5, 0)
B. Vertices: (0, 
) and (0, -
);
Foci: (0, 
) and (0, -
)
C. Vertices: (
, 0) and (-
, 0);
Foci: (
, 0) and (-
, 0)
D. Vertices: (0, 
) and (0, -
);
Foci: (0, 
) and (0, -
)
Identify the radicand.xy2
A. 
B. x + 2
C. xy2
D. 