Write the sentence as an equation. Let the variable x represent the number.The sum of twice a number and 7 is 17.
A. 2x - 7 = 17
B. 14x = 17
C. 2x + 7 = 17
D. x + 14 = 17
Answer: C
Mathematics
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Solve the problem.Find the combined impedance of the circuit elements in the figure below. The frequency of the current is 70 Hz. 80 ? 
85 ?F50 mH
A. Z = -4.74 + 0.28j ? B. Z = 0.28 - 4.74j ? C. Z = 80 - 4.76j ? D. Z = -4.74 - 0.28j ?
Mathematics
Perform the indicated operation without the use of a calculator and express each answer in decimal notation.
A. 29,400,000,000,000 B. 600,000 C. 29,400,000 D. 600,000,000,000
Mathematics
Find the angle between v and w. Round to one decimal place, if necessary.v = 3i + 2j + k and w = 4i + 8j + 2k
A. 61° B. 68.8° C. 29° D. 82.8°
Mathematics
Evaluate the function.Given f(x) = x2 - 5x - 1, find f(-2).
A. 15 B. -7 C. 13 D. -5
Mathematics