Express the sum or difference as a product of sines and/or cosines.cos 
+ cos 
A. 2 cos(4?)
B. 2 cos(4?) cos 
C. 2 sin(4?) sin ?
D. 2 sin(4?) sin 
Answer: B
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Find the graph that matches the given system of equations.3x - y = 13
A. 
B. 
C. 
D. 
Let P(t) be the performance level of someone learning a skill as a function of the training time t. The graph of P is called a learning curve. We propose the differential equation
as a reasonable model for learning, where r is a positive constant. Solve it as a linear differential
equation.
Provide an appropriate response.If (3x - 2)(5x - 4) is the LCD of two fractions, is (2 - 3x)(4 - 5x) also acceptable as an LCD? Why or why not?
What will be an ideal response?
Find the probability to the nearest hundredth that the value of the random variable is within one standard deviation of the mean.f(x) = 
; [3, 10]
A. 0.67 B. 0.50 C. 0.58 D. 0.75