Solve the problem.Walt made an extra $9000 last year from a part-time job. He invested part of the money at 7% and the rest at 10%. He made a total of $720 in interest. How much was invested at 10%?
A. $4500
B. $6000
C. $7000
D. $3000
Answer: D
Mathematics
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Solve the problem.The growth rate of a certain tree (in feet) is given by y = 
+ e-t2/2 , where t is time in years. Estimate the total growth of the tree through the end of the second year by using Simpson's rule. Use 2 subintervals. Round your answer to the nearest hundredth.
A. 3.68 ft B. 5.11 ft C. 2.34 ft D. 3.41 ft
Mathematics
Describe the graph of the polar equation.r2 = 36 rcos ? - 6r sin ? - 9
A. Parabola opening upward with vertex (36, -6) B. Circle with radius 18 and center (18, -3) C. Circle with radius 3 and center (36, -6) D. Parabola opening to the right with vertex (36, -6)
Mathematics
Find the value. 
A. 48.059 B. 36.621 C. 33.353 D. 30.293
Mathematics
Evaluate the expression.|10(-1)| - |1 - 7|
A. 16 B. -16 C. -4 D. 4
Mathematics