Use the inverse of the coefficient matrix to solve the system of equations. y + z = 8,3x -z = 5, 2x + y + 3z = 9; A-1 = - 
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Use a graph to find an approximate solution to the equation. Round to the nearest thousandth.e3x e4x = e4
A. -0.709 B. 0.571 C. 0.754 D. 1.851
Mathematics
Solve the problem. Write the answer in lowest terms.Mr. Howard installed 
-inch roofing shingles on top of a 
thick tar paper. What was the combined thickness of the two layers of materials?
A. 
inch
B. 
inch
C. 
inch
D. 
inch
Mathematics
Find the length of the unknown side of the right triangle. In each case, a and b represent the lengths of the legs and c represents the length of the hypotenuse.
b = 9, c = 15; find a
A. 14 B. 12 C. 15 D. 11
Mathematics
Simplify the expression.(-19) + 60 ÷ (-6)
A. 7 B. -29 C. 29 D. -7
Mathematics