Solve by elimination.-7x + 6y = -30-4x + 3y = -15
A. No solution
B. (0, -5)
C. (0, -4)
D. (-1, -4)
Answer: B
Mathematics
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Use the pH scale to answer the question.What is the hydrogen ion concentration of a solution with pH 2.5?
A. 3.2 x 10-3 B. 3.2 x 10-2 C. 3.2 x 10-5 D. 3.2 x 10-4
Mathematics
Choose the equation that matches the graph. 
A. y + 2 = 0 B. y - 2 = 0 C. x - 2 = 0 D. x + 2 = 0
Mathematics
Use the discriminant to determine the number of solutions of the quadratic equation.4 + 4z2 = 5z
A. 1 real solution B. no real solution C. 2 real solutions
Mathematics
Subtract. Use borrowing, if necessary. 
A. 4966 B. 3856 C. 4144 D. 5166
Mathematics