Use an inverse matrix to find the solution to the system.
A. x = 1, y = 5, z = 1
B. x = 8, y = -1, z = 5
C. x = 7, y = 1, z = 5
D. x = 7, y = -1, z = -5
Answer: C
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Solve. If needed, round money amounts to two decimal places and all other amounts to one decimal place.A chemist needs 60 milliliters of a 72% solution but has only 64% and 88% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 50 ml of 64%; 10 ml of 88% B. 40 ml of 64%; 20 ml of 88% C. 20 ml of 64%; 40 ml of 88% D. 10 ml of 64%; 50 ml of 88%
Classify the following statement as true or false.The diagonals of a rectangle bisect each other.
A. True B. False
Let 
Find the composite function.
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Solve the system of equations using substitution.
A. x = -12, y = 5; x = -5, y = 12 or (-12, 5), (-5, 12) B. x = 12, y = 5; x = 5, y = 12 or (12, 5), (5, 12) C. x = -12, y = -5; x = -5, y = -12 or (-12, -5), (-5, -12) D. x = 12, y = -5; x = 5, y = -12 or (12, -5), (5, -12)