Find the sum. Simplify when necessary.-3 + 9
A. 6
B. 12
C. -6
D. -12
Answer: A
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Solve the problem.The position (in centimeters) of an object oscillating up and down at the end of a spring is given by 
at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. Find the object's acceleration at time t.
A. a = - A sin 
cm/sec2
B. a = 
cos 
cm/sec2
C. a = - A
sin 
cm/sec2
D. a = - 
sin 
cm/sec2
Use truth tables to test the validity of the argument.p ? q
? ~p
A. Invalid B. Valid
Solve the problem.The sum of a student's three scores is 230. If the first is 19 points more than the second, and the sum of the first two is 23 more than twice the third, then what was the first score?
A. 69 B. 90 C. 50 D. 71
Find an equivalent expression for the number, using the denominator indicated.
= 
A. 
B. 
C. 
D. 