Solve the equation.
- 
= 4
A. 120
B. -120
C. 60
D. -60
Answer: C
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Solve the problem.The side of an equilateral triangle is 8 inches shorter than the side of a square. The perimeter of the square is 46 inches more than the perimeter of the triangle. Find the length of a side of the triangle.
A. 24 inches B. 21 inches C. 14 inches D. 22 inches
Solve the problem.A person with no more than $2000 to invest plans to place the money in two investments, telecommunications and pharmaceuticals. The telecommunications investment is to be no more than 3 times the pharmaceuticals investment. Write a system of inequalities to describe the situation. Let 
to be invested in telecommunications and 
to be invested in pharmaceuticals.
A. x + y = 2000 y ? 3x x ? 0 y ? 0 B. x + y ? 2000 3x ? y x ? 0 y ? 0 C. x + y ? 2000 x ? 3y x ? 0 y ? 0 D. x + y = 2000 x ? 3y x ? 0 y ? 0
Find the inverse of the matrix, if possible.A = 
A. 
B. 
C. 
D. 
First, use front-end rounding to round each number and estimate the answer. Then, find the exact answer.Chi bought 2 items at Lucky Pete's market. She bought a pound of butter for $0.50 and a gallon of milk for $2.69. What was the total amount that she paid for both of these items?
A. Estimate: $ 4; exact: $1.5 B. Estimate: $ 5; exact: $1.5 C. Estimate: $ 4; exact: $3.19 D. Estimate: $ 3; exact: $3.19