Solve the problem.Helen Weller invested $10,000 in an account that pays 12% simple interest. How much additional money must be invested in an account that pays 15% simple interest so that the total interest is equal to the interest on the two investments at the rate of 13%?
A. $7000
B. $10,000
C. $5000
D. $6000
Answer: C
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Solve the system of equations using the inverse of the coefficient matrix.-4x - y + 3z = -37-9x + 3y + 4z = -52-9x - 5y + z = -114
A. No solution B. x = -9, y = 7, z = 18 C. x = 9, y = 2, z = 7 D. x = 9, y = 7, z = 2
Solve the problem.The table below gives the sales tax rate as a percent in a certain city between 2007 and 2012:
Write a symbolic representation for a function f that models this data.
A. f(x) = 4
B. f(x) = 
C. f(x) = 
x
D. f(x) = 4x
Write a general formula to describe the variation.A varies directly with t2; A = 128 when t = 8
A. A = 16t2
B. A = 
C. A = 
D. A = 2t2
Convert the rectangular coordinates of the point to polar coordinates (r, ?) with r > 0 and 0 ? ? < 2?.(0, -6)
A. 
B. (6, 0)
C. (6, ?)
D. 