Find x and y.
= 
A. x = -2, y = 7
B. x = 7, y = 7
C. x = -2, y = -2
D. x = 7, y = -2
Answer: D
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Identify the exercise as either a permutation (order matters) or combination (order does not matter) counting problem. Do not actually solve the exercise.A record club offers a choice of 7 records from a list of 45. In how many ways can a member make a selection?
A. Combination B. Permutation
The frequency of vibrations of a piano string varies directly as the square root of the tension on the string and inversely as the length of the string. The middle A string has a frequency of 410 vibrations per second. Find the frequency of a string that has 1.75 times as much tension and is 1.2 times as long.
What will be an ideal response?
Use the method of your choice to find the least common multiple of the numbers.3 and 15
A. 45 B. 3 C. 5 D. 15
Solve the system of equations. [Hint: Let u = 
and v = 
, and solve for u and v. Then let x = 
, and y = 
.]
A. x = -8, y = 
; 
B. x = 
, y = -8; 
C. x = 
, y = - 
; 
D. x = - 
, y = 
; 