Solve the problem using matrices.Jerry has three pieces of string. The total length is 107 cm. The sum of the two longer pieces is 89 cm. The middle piece is twice as long as the shortest piece. What are the lengths of the three pieces?
A. 18 cm; 36 cm; 53 cm
B. 9 cm; 18 cm; 80 cm
C. No solution
D. 18 cm; 53 cm; 63 cm
Answer: A
Mathematics
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Solve the problem.Walt made an extra $9000 last year from a part-time job. He invested part of the money at 10% and the rest at 7%. He made a total of $780 in interest. How much was invested at 7%?
A. $5000 B. $7000 C. $4500 D. $4000
Mathematics
Find the coordinates of the vertex for the parabola defined by the given quadratic function.f(x) = -7(x - 2)2 - 8
A. (-2, -8) B. (2, -8) C. (-8, 2) D. (-7, -2)
Mathematics
Determine whether the two pairs of numbers are proportional.5, 14 and 10, 28
A. No B. Yes
Mathematics
Divide as indicated.(-12x3 + 13x2 + 6x - 3) ÷ (-3x + 1)
A. 4x2 - 3x - 3 B. x2 + 3x + 3 C. 4x2 - 3 D. x2 - 3x - 3
Mathematics