Write a system of equations for the problem, and then solve the system.Two trains start from towns 572miles apart and travel toward each other on parallel tracks. They pass each other 5.5 hours later. If one train travels 18 mph faster than the other, find the speed of each train.
A. 63 mph; 41 mph
B. 61 mph; 43mph
C. 51 mph; 53 mph
D. 56 mph; 48 mph
Answer: B
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Which property or identity justifies the statement?
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= 
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+ 
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A. Multiplication Property B. Associative Property C. Distributive Property D. Commutative Property
In the circuit below, Vin = 7 V, R = 250 ê, xC = 1000 ê at fr, and C = 90 pF. Find fr and Q.
a. fr = 3.1 MHz, Q = 10
b. fr = 1.8 MHz, Q = 4
c. fr = 1.8 MHz, Q = 1.8
d. fr = 1.2 MHz, Q = 6
e. fr = 1.0 MHz, Q = 4
Multiply or divide as indicated. Make sure that your answer is reasonable by estimating first. 8.5 × 1.2
A. 10.31 B. 10.20 C. 10.3 D. 10.311
For the pair of functions, find the indicated sum, difference, product, or quotient.f(x) = x + 5, g(x) = -4x2 + 17x - 6Find (fg)(4).
A. 702 B. -18 C. 2 D. 70