Apply the product rule for exponents, if possible. x3 ? x6
A. x7
B. x18
C. x10
D. x9
Answer: D
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Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at x = -2 and x = 2. The cross sections perpendicular to the x-axis are circles whose diameters stretch from the curve 
to the curve 
A. 81?2
B. 
?2
C. 
?2
D. 81?
Illustrate and find the product by the indicated method.Use repeated addition on your calculator to find 7679 × 5.
A. 7679 × 5 = 5 × 7679 = 7679 × 7679 × 7679 × 7679 × 7679 = 38,395 B. 7679 × 5 = 5 × 7679 = 7679 + 7679 + 7679 + 7679 + 7679 = 38,395
Determine if the graph of the function is concave up or concave down.f(x) = 2x2 + 2x - 4
A. Concave up B. Concave down
Find the sum of the arithmetic sequence.{-6n - 1}, n = 38
A. -4,370 B. -4,313 C. -4,484 D. -4,180