The percentage, P, of students who recall the important features of a lecture after x days is given by the formula 
. Use this formula and the change-of-base formula to find the percentage, P, of a lecture retained after the given number of days. Round your answer to the nearest whole percent.3 days
A. 62%
B. 49%
C. 47%
D. 52%
Answer: C
Mathematics
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Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. no solution; ? B. {(1, 8)} C. {(1, 7)} D. {(0, 8)}
Mathematics
Perform the indicated operation.(3x2 + 7x - 1) - (-5x2 + 9x + 2) + (-2x2 - 3x - 5)
A. 6x2 - 5x - 8 B. -4x2 + 5x - 8 C. -4x2 - 5x + 8 D. 6x2 + 13x + 4
Mathematics
Simplify the rational expression.
A. - 
B. 
C. 
D. 
Mathematics
Fill in the blank with one of the words or phrases listed below.
A(n) 
of a system of two equations in two variables is an ordered pair of numbers that is a solution of both equations in the system.
A. consistent B. dependent C. substitution D. solution
Mathematics