If possible, solve each system by an algebraic method (substitution or addition method). Otherwise, state that the problem has no solution or an infinite number of solutions.9x - 4y = 47-0.5x + 0.3y = -2.3
A. (4, 7)
B. (7, 4)
C. (7, 5)
D. (6, 5)
Answer: B
Mathematics
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Solve using matrices.2x - y + 7z = 577x + 7z = 70 8y + z = 73
A. (1, 9, 8) B. (8, 9, 1) C. (-1, 8, 2) D. (1, 8, 9)
Mathematics
Solve the equation.
= 
A. r = 2 B. r = -1 C. r = 1 D. r = -2
Mathematics
Solve the problem.The quad at State University is 3x feet wide. Initially, it was 1300 feet long. However, due to the construction of a new science building, the original length was decreased by 6y feet. Use the distributive property to find an expression for the area of the new quad.
A. 3900x - 7800y square feet B. 3900x + 18xy square feet C. 3900x + 7800y square feet D. 3900x - 18xy square feet
Mathematics
Write the expression in the standard form a + bi.If w = 9 + 7i, evaluate w - 
.
A. 18 B. 0 C. 14i D. -18 + 14i
Mathematics