First, use front end rounding to estimate each answer. Then find the exact answer.If 69 members of a charity raise an average of 
, what is the total amount of money raised?
A. estimate: $120 ? 70 = $8400; exact: $8211
B. estimate: $100 ? 69 = $6900; exact: $8211
C. estimate: $100 ? 70 = $7000; exact: $8211
D. estimate: $119 ? 70 = $8330; exact: $8211
Answer: C
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Write the equation of a sine or cosine function that describes the path of the given curve.
A. y = 3 sin x B. y = 3 sin (3x) C. y = 3 sin (6x) D. y = sin (3x)
Solve the problem.In the formula N = Iekt, N is the number of items in terms of an initial population I at a given time t and k is a growth constant equal to the percent of growth per unit time. There are currently 72 million cars in a certain country, increasing by 1.3% annually. How many years will it take for this country to have 90 million cars? Round to the nearest year.
A. 14 yr B. 17 yr C. 222 yr D. 5 yr
Write out the sum.
A. 
+ 
+ 
+ ... + 
B. 0 + 
+ 
+ ... + 
C. 
+ 
+ 
+ ... + 
D. 1 + 
+ 
+ ... + 
Factor.49 - 81x2
A. (7 + 9x)2 B. (7 - 9x)2 C. 49 - 81x2 D. (7 + 9x)(7 - 9x)