Using the horizontal-line test, determine whether the function is one-to-one.
A. one-to-one
B. not one-to-one
Answer: A
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The table lists data that are exactly linear. (i) Find the slope-intercept form of the line that passes through these data points. (ii) Predict y when x = -1.5 and 4.6. 
A. y = 2.2x - 7.9; y = -11.2, y = 2.22 B. y = 2.2x + 7.9; y = 4.6, y = 18.02 C. y = 2.2x - 0.9; y = -4.2, y = 9.22 D. y = -2.2x + 7.9; y = 11.2, y = -2.22
Solve the system of equations by elimination.x + y = -2x - y = 13
A. (2, 5.5) B. (5.5, 7.5) C. (5.5, -7.5) D. (2, -7.5)
Solve the problem.The following scatter diagram shows heights (in inches) of children and their ages.Height (inches)
Age (years)What happens to height as age increases?
A. Height decreases as age increases. B. Height stays the same as age increases. C. Height increases as age increases. D. Height and age do not appear to be related.
Combine like terms in the expression. Answer "not possible" if terms cannot be combined.3x + 10x
A. 13x B. 26x C. 30x D. 13x2