Write the set using the roster method.{x|x is a counting number less than 21}
A. { . . . , 19, 20, 21}
B. {0, 1, 2, . . . , 18, 19, 20}
C. {1, 2, 3, . . . , 19, 20, 21}
D. {1, 2, 3, . . . , 18, 19, 20}
Answer: D
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Use logarithmic differentiation to find the derivative of y with respect to the independent variable.y = x7 sin x
A. 7 sin x ln x
B. 7 cos x ln x + 
C. x sin x
D. 7 x7 sin x
Factor the binomial completely. If it is prime, say so.98a4 - 72b2
A. 2(7a2 - 6b)2 B. 2(7a2 + 6b)2 C. 2(7a2 + 6b)(7a2 - 6b) D. Prime
Solve the problem.Matt bought 3 pounds of oranges and 2 pounds of apples and paid src="https://sciemce.com/media/4/ppg__gfghf0512192144__f1q41g4.jpg" alt="" style="vertical-align: -15.0px;" />
A. $0.76 per pound
B. $0.79 per pound
C. $0.72 per pound
D. $0.74 per pound
before tax. Andy bought 4 pounds of oranges and 3 pounds of apples and paid 
before tax. Use this information to set up a matrix equation of the form AX = B, which can be solved to determine the price per pound for oranges and apples. Solve this matrix equation to find the price per pound of oranges.Use the fact that for 
Write the number in decimal notation.
?
?
A. 31.276 B. 3.127 C. 67.213 D. 3.1276 E. 312.76