Suppose that in an assortment of 6 calculators, there are 3 with defective switches. Draw with and without replacement. If two machines are selected at random, what is the probability that both have defective switches?
?
A. with : 
, without : 
B. both : 
C. with : 
, without : 
D. both : 
E. none of these
Answer: A
Mathematics
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Graph the equation and give the coordinates of the vertex.y = (x - 2)2
A. (0, 2)
B. (2, 0)
C. (0, -2)
D. (-2, 0)
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Write the expression in the form a + bi.
A. 
- 
i
B. 1 - 
i
C. 
+ 
i
D. 
- 
i
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Find the exact values of the indicated trigonometric functions. Write fractions in lowest terms.
Find sin B and tan B.
A. sin B = 
; tan B = 
B. sin B = 
; tan B = 
C. sin B = 
; tan B = 
D. sin B = 
; tan B = 
Mathematics
Solve the system of equations using substitution.
A. x = 10, y = 2; x = 2, y =10 B. x = 6, y = 3; x = 3, y = 6 C. x = 20, y = 1; x = 1, y = 20 D. x = 5, y = 4; x = 4, y = 5
Mathematics