Find n for the given value of an in the arithmetic sequence.an = 277?; 1?, 7?, 13?, . . .
A. n = 46
B. n = 45
C. n = 47
D. n = 49
Answer: C
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Find the points of intersection of the graphs of the functions. Express your answers accurate to five decimal places.
Write the expression with positive exponents. Then simplify if possible.4-1 + 7-1
A. - 
B. 
C. 2
D. 
Graph the plane curve given by the parametric equations. Then find the equivalent rectangular equation.x = t + 7, y = 
; -5 ? t ? 5
A. y = 
; 2 ? x ? 7
B. y = 
; 2 ? x ? 12
C. y = x; 2 ? x ? 12
D. y = 
; 2 ? x ? 12
Solve.Some people must eat a low-sodium diet with no more than 2,000 mg of sodium per day. By eating 1 cracker, 1 pretzel, and 1 cookie, a person would ingest 149 mg of sodium. If a person ate 8 pretzels and 8 cookies, he or she would ingest 936 mg of sodium. By eating 6 crackers and 7 pretzels, the person would take in 535 mg of sodium. Which of the following is true?
A. A cracker has 30 mg of sodium. B. A pretzel has 49 mg of sodium. C. A cookie has 71 mg of sodium. D. None of these