Solve the system by addition.-7x - 23 = 8y-2x - 2y = 6
A. {(-1, -2)}
B. ?
C. {(-2, -1)}
D. {(-1, -1)}
Answer: A
Mathematics
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A. 
B. - 13
C. - 
D. 13
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Find the average value of 
over the given region.
over the cube in the first octant bounded by the coordinate planes and the planes 
, 
, 
A. 288 B. 36 C. 2592 D. 324
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Use the formula B = P + Prt, which is used to calculate the balance in an account if simple interest is added to a principal P at an interest rate of r for t years.Suppose that an account earns 6.3% interest and after five years the balance is $5418.00. Find the principle that was invested.
A. $3708.14 B. $7909.49 C. $4120.15 D. $4944.18
Mathematics
Evaluate the expression.43 - (2 + 5
) + 26 - 11
A. 87 B. 57 C. 5 D. 67
Mathematics