Use the empirical probability formula to solve the exercise. Express the answer as a fraction. Then express the probability as a decimal, rounded to the nearest thousandth, if necessary.In 1999 the stock market took big swings up and down. A survey of 998 adult investors asked how often they tracked their portfolio. The table shows the investor responses. What is the probability that an adult investor tracks his or her portfolio daily?
A. 
; 0.288
B. 
; 0.145
C. 
; 0.279
D. 
; 0.235
Answer: D
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Perform the division.
A. 3r7 - 5r4 B. 3r5 - 5r2 C. 9r5 - 15r2 D. 3r6 - 5r3
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) = x2 - 2, [0, 8], right-hand endpoint
A. 
B. 
C. 
D. 
Plot the points given by the pairs.A(2, 3), B(-6, 4)
What will be an ideal response?
Solve the problem.An airline with two types of airplanes, P1 and P2, has contracted with a tour group to provide transportation for a minimum of 400 first class, 750 tourist class, and 1500 economy class passengers. For a certain trip, airplane P1 costs $10,000 to operate and can accommodate 20 first class, 50 tourist class, and 110 economy class passengers. Airplane P2 costs $8500 to operate and can accommodate 18 first class, 30 tourist class, and 44 economy class passengers. How many of each type of airplane should be used in order to minimize the operating cost?
A. 7 P1 planes and 11 P2 planes B. 11 P1 planes and 7 P2 planes C. 9 P1 planes and 13 P2 planes D. 20 P1 planes and 0 P2 planes