Solve the system by the method of your choice. Identify systems with no solution and systems with infinitely many solutions, using set notation to express their solution sets.x - 7y = -2-3x + 21y = 6
A. {(0, 0)}
B. {(-2, 0)}
C. {(x, y) | x - 7y = -2}
D. ?
Answer: C
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Use the given transformation to evaluate the integral. src="https://sciemce.com/media/4/ppg__10611192124__f1q22g7.jpg" alt="" style="vertical-align: -4.0px;" />
A. - 13
B. - 17
C. - 26
D. - 34
Rwhere R is the parallelogram bounded by the lines 
Write each equation in standard form and identify a, b, and c. 7x2 = 9x - 21
A. a = 7, b = -9, c = -21 B. a = 7, b = -9, c = 21 C. a = 7, b = 9, c = 21 D. a = 7, b = 9, c = -21
Solve the problem.A company makes 3 types of cable. Cable A requires 3 black, 3 white, and 2 red wires. B requires 1 black, 2 white, and 1 red. C requires 2 black, 1 white, and 2 red. The company used 95 black, 100 white and 80 red wires. How many of each type of cable were made?
A. 48 A; 20 B; 12 C B. 15 A; 20 B; 15 C C. 20 A; 15 B; 15 C D. 15 A; 16 B; 15 C
Solve the problem.The decay of 200 mg of an isotope is given by 
where t is time in years since the initial amount of 200 mg was present. Find the amount left (to the nearest mg) after 71 years.
A. 43 mg B. 198 mg C. 85 mg D. 84 mg