Solve the problem.Helen Weller invested $12,000 in an account that pays 10% simple interest. How much additional money must be invested in an account that pays 13% simple interest so that the average return on the two investments amounts to 11%?
A. $12,000
B. $6000
C. $9000
D. $8000
Answer: B
Mathematics
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Solve.John owns a hotdog stand. He has found that his profit is represented by the equation 
with P being the profit in dollars, and x the number of hotdogs sold. How many hotdogs must he sell to earn the most profit?
A. 25 hotdogs B. 40 hotdogs C. 41 hotdogs D. 50 hotdogs
Mathematics
Use Gaussian elimination to solve the linear system by finding an equivalent system in triangular form.
A. (0, 3, -3) B. no solution C. (0, 3, 0) D. (0, 0, 3)
Mathematics
Find the domain of the function.f(x) = 7x + 2
A. (-?, ?) B. (-2, ?) C. (0, ?) D. (-?, 0) ? (0, ?)
Mathematics
Maximize 
subject to the constraints.
?
?
T = ____ at ( ____, ____ )
What will be an ideal response?
Mathematics