Find the equation of the indicated least-squares curve. Sketch the curve and plot the data points on the same graph.The following data were found for the distance y that an object rolled down an inclined plane in time x. Find the least-squares curve 
A. y = 6.53x2 + 6.81
B. y = 13.06x2 + 3.41
C. y = 9.7x2 + 15.1
D. y = 6.53x2 - 6.81
Answer: A
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Solve the problem.A ladder is resting against a wall. The top of the ladder touches the wall at a height of 15 ft. Find the length of the ladder if the length is 5 ft more than its distance from the wall.
A. 20 ft B. 15 ft C. 30 ft D. 25 ft
Solve the problem.Jane wants to buy a photocopier. The salesman has the following information on 3 models. If all 3 are used, a specific job can be done in 50 minutes. If copier A operates for 20 minutes and copier B for 50 minutes, one-half the job is finished. If copier B operates for 30 minutes and copier C for 80 minutes, three-fifths of the job is done. Which is the fastest copier, and how long does it take for this copier to finish the whole job?
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Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 2 years. If necessary, round to three decimal places.
A. 3103.691 B. 2.202 C. 0.220 D. 310.369
Find the indicated limit.
int x
A. 8 B. -8 C. 0 D. 9