Solve the number problem by finding the value of the unknown number.If three times a number is decreased by 1, the result is 20.
A. 6
B. 8
C. 10
D. 7
Answer: D
Mathematics
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Solve.x2 - x = 20
A. x = 4, 5 B. x = -4, 5 C. x = -4, -5 D. x = 1, 20
Mathematics
Choose the correct response.Suppose that x ounces of a 25% acid solution are mixed with y ounces of a 35% solution to obtain 85 ounces of a 32% solution. One equation in a system for solving this problem is 
Which of the following is the other equation?
A. .35x + .25y = .32(85) B. .25x + .35y = .32(85) C. 35x + 25y = 32 D. 25x + 35y = .32(85)
Mathematics
Solve the problem.The area of a parallelogram is 285 cm2. The height is 19 cm. What is the length of the base?
A. 270 cm B. 7.5 cm C. 15 cm D. 30 cm
Mathematics
Decide what number must be added to the binomial to make a perfect square trinomial.x2 + 9x
A. 18
B. 
C. 
D. - 
Mathematics