Clear fractions then solve by substitution. 
x + y = 
+ 2y 4x - 4 + 
= -3 + 5x
A. ?
B. 
C. 
D. 
Answer: B
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In work with alternating current, complex numbers are used to describe current I, voltage E, and impedance Z. These three quantities are related by the equation E = IZ. Solve the equation E = IZ for the missing variable.I = 7 + 2i, Z = 5 + 4i
A. E = 35 + 8i B. E = 43 + 38i C. E = 27 + 38i D. E = 35 + 46i
Find the indicated term.-3, -6, -12, -24 , . . . ; 10th term
A. -512 B. -1536 C. 768 D. 6144
Either the dimensions of two matrices or the matrices themselves are given. Find the dimensions of the product AB and the product BA. If either is not defined, say so.A is 3 × 1; B is 1 × 3.
A. AB is not defined; BA is 1 × 1. B. AB is 3 × 3; BA is 1 × 1. C. AB is 1 × 1; BA is 3 × 3. D. AB is 3 × 3; BA is not defined.
Simplify the power of i to i, 1, -i or -1.
A. i B. 1 C. -1 D. -i