Solve the system of equations using substitution.
A. (-2, -4)
B. (2, -4)
C. (-2, 4)
D. (2, 4)
Answer: C
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Graph the function f(x) over the given interval. Partition the interval into 4 subintervals of equal length. Then add to your sketch the rectangles associated with the Riemann sum 
, using the indicated point in the kth subinterval for ck.f(x) = 2x + 4, [0, 2], left-hand endpoint
A. 
B. 
C. 
D. 
Evaluate the exponential function at the specified value of x.y = 16x, x = -0.25
A. 2
B. -2
C. 
D. 4
Solve the problem.Dr. Wong can see 12 patients in 2 hours. At this rate, how long would it take her to see 36 patients?
A. 5 hr B. 24 hr C. 216 hr D. 6 hr
Solve. Express the result in scientific notation. Round to the nearest hundredth, if necessary.If the mass of an object is 8.8168 × 10-10 tons and its volume is 4.12 × 10-5 cubic feet, find the density of this object. (Use the formula D = 
.)
A. 2.14 × 10-5 tons per cubic foot B. 2.14 × 10-6 tons per cubic foot C. 2.14 × 10-4 tons per cubic foot D. 21.4 × 10-5 tons per cubic foot