Solve the linear equation.-y + 25 + 5y = 7 + 10y
A. -18
B. -3
C. 3
D. 18
Answer: C
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Solve the problem.During one year, the Cheung's real estate bill included $285 for county services. Of this amount, $52 went to the highway department. What percent did the county highway department receive? (Round answer to two decimal places.)
A. 17.89% B. 81.75% C. 18.25% D. 1482.00%
Multiply. Simplify by combining like terms.
A. x2 - 
xy + 
y2
B. x2 - 
xy - 
y2
C. x2 - 
xy + 
y2
D. x2 + 
y2
Tell whether a linear model or a quadratic model is appropriate for the data. If a quadratic model is appropriate, then decide also whether the lead coefficient should be positive or negative.The height of a bouncing ball during one bounce, as a function of time.
A. Quadratic; leading coefficient positive B. Linear C. Quadratic; leading coefficient negative
Solve the problem using two linear equations in two variables and Cramer's rule.Two different gasohol mixtures are available. One contains 5% alcohol and the other 12% alcohol. How much of each should be mixed to obtain 500 gal of gasohol containing 10% alcohol? (Round to the nearest whole gallon.)
A. 208 gal 5%, 292 gal 12% B. 25 gal 5%, 60 gal 12% C. 357 gal 5%, 357 gal 12% D. 143 gal 5%, 357 gal 12%