Solve the problem.Walt made an extra $7000 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 $580 in interest. How much was invested at 10%?
A. $3500
B. $3000
C. $4000
D. $5000
Answer: B
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Solve the problem.A cubic salt crystal expands by accumulation on all sides. As it expands outward find the rate of change of its volume with respect to the length of an edge when the edge is 
A. 0.6075 mm3/mm B. 0.27 mm3/mm C. 60.75 mm3/mm D. 6.08 mm3/mm
Write a fraction in lowest terms that represents the portion of the figure that is shaded.
A. 
B. 
C. 
D. 
Write an algebraic expression to answer the question and simplify.A stack of currency contains 60 bills. In the stack are x $20 bills. The rest are $50 bills. How much money is in the stack of bills?
A. 20x + 50(60 - x); -30x + 3000 dollars B. 20x - 50(60 - x); 70x - 3000 dollars C. 20x + 50(60 - x); 30x + 3000 dollars D. Cannot be solved
Find the decimal equivalent of the fraction.
A. 2.68 B. 2.64 C. 2.85 D. 2.675