Solve the problem.In electronics, the impedance Z of an alternating series circuit is given by the formulaZ = 
, where R is the resistance and X is the reactance, both in ohms. Find the value of the impedance Z if 
and X = 48 ohms.
A. 28 ohms
B. 52 ohms
C. 68 ohms
D. 44 ohms
Answer: B
Mathematics
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Express as a difference of logarithms.log 
A. log 14 ÷ log 3 B. log (14 - 3) C. log 14 - log 3 D. log 3 - log 14
Mathematics
Use a calculator to approximate the expression. Write your answer in scientific notation, and round to the nearest tenth as needed.(2.5 × 105) + (1.3 × 107)
A. 1.3 × 10-12 B. 1.5 × 10-7 C. 1.3 × 107 D. 1.5 × 1012
Mathematics
Identify the following as a linear expression or a linear equation.5x + 7y = 3
A. linear equation B. linear expression
Mathematics
Solve.A number is doubled and then decreased by 14. The result is 72. What is the original number?
A. 29 B. 43 C. 172 D. -29
Mathematics