Determine the validity of the argument.Some investments are risky.Real estate is an investment.Therefore real estate is risky.
A. Not valid
B. Valid
Answer: A
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Solve the problem.For what value of r does the infinite series 1 + 2r + 5r2 + 2r3 + r4 + 2r5 + 5r6 + 2r7 + r8 + ... converge?
A. |r| < 
B. |r| < 
C. |r| < 
D. |r| < 1
Solve the problem.Find the measure of an angle whose supplement is 6 times the measure of its complement.
A. 15° B. 72° C. 30° D. 36°
Solve the problem.A ladder that is 13 feet long is 5 feet from the base of a wall. How far up the wall does the ladder reach?
A. 
ft
B. 12 ft
C. 144 ft
D. 2
ft
Solve the problem.Data representing the price and quantity demanded for hand-held electronic organizers were analyzed every day for 15 days. The logarithmic function of best fit to the data was found to be 
Use this to predict the number of hand-held electronic organizers that would be demanded if the price were $275.
What will be an ideal response?