Solve the problem.Lexie wants to have an income of $9000 per year from investments. To that end she is going to invest $90,000 in three different accounts. These accounts pay 7%, 10%, and 14% simple interest. If she wants to have $10,000 more in the account paying 7% simple interest than she has in the account paying 14% simple interest, how much should go into each account?
What will be an ideal response?
$40,000 at 7%, $20,000 at 10%, $30,000 at 14%
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Provide an appropriate response.Graph f(x) = cos-1 x together with its first derivative. Comment on the behavior of f and the shape of its graph in relation to the signs and values of f'. 
What will be an ideal response?
The educational attainment of a country’s population age 25 years or older in 2007 is shown in the circle graph. Use the fact that the population of people 25 years or older was approximately 8.0 million in 2007 and let , , and . Find the probability that a person 25 years or older selected at random has earned a bachelor’s degree or higher.
a. 0.294
b. 1.294
c. 4.294
d. 2.294
The following figure is composed of one large and three small semicircles. Find the shaded area enclosed by the four semicircles. Give the exact answer.
Each matrix is nonsingular. Find the inverse of the matrix. Be sure to check your answer.
A. 
B. 
C. 
D. 