Use the commutative and associative properties to simplify the expression.- 
(-8y)
A. 3y
B. 2y
C. -4y
D. -2y
Answer: B
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Provide an appropriate response.Suppose X is uniformly distributed over the interval 
. Find P(2 < X < 4).
Fill in the blank(s) with the appropriate word(s).
Determine where the function is increasing and where it is decreasing.f(x) = -x2 - 12x
A. increasing on (6, ?) decreasing on (-?, 6) B. increasing on (-?, -6) decreasing on (-6, ?) C. increasing on (-?, 6) decreasing on (6, ?) D. increasing on (-6, ?) decreasing on (-?, -6)
Solve the problem.A rumor is spread at an elementary school with 1200 students according to the model 
where N is the number of students who have heard the rumor and d is the number of days that have elapsed since the rumor began. How many days must elapse for 500 to have heard the rumor?
Fill in the blank(s) with the appropriate word(s).
Solve the problem.Suppose the sales of a particular brand of appliance satisfy the relationship 
, where S represents the number of sales in year x, with 
corresponding to 1982. Find the number of sales in 1992.
A. 9800 sales B. 4680 sales C. 4900 sales D. 9580 sales