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).
about 3.4 days
Mathematics
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Divide.
A. 548 B. 558 R 16 C. 553 R 8 D. 538
Mathematics
Simplify the expression. Express the answer so that only positive exponents occur. Assume that all variables are positive.(5x3/4)(3x2/3)
A. 15x17/12 B. 15x3/4 C. 15x17/7 D. 15x5/12
Mathematics
Find the average rate of change for the function between the given values.f(x) = 8x3 - 2x2 + 2; from -5 to 3
A. 156
B. 
C. 416
D. 25
Mathematics
Solve the problem.Suppose a life insurance policy costs $20 for the first unit of coverage and then $5 for each additional unit of coverage. Let C(x) be the cost for insurance of x units of coverage. What will 10 units of coverage cost?
A. $50 B. $65 C. $70 D. $30
Mathematics