The output is the total cost of a shirt, where x is the price of the shirt and a sales tax of 9% of the price is added. Write an equation describing the output (y) as a function of the input (x).
A. y = 1.09x
B. y = x + 0.09
C. y = x – 0.09
D. y = 0.91x
E. y = 0.09x – 1
A. y = 1.09x
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Match the equation with the surface it defines.- 
+ 
+ 
= 1 
A. Figure 1 B. Figure 2 C. Figure 3 D. Figure 4
Add or subtract as indicated. Express the answer as a single polynomial in standard form.(6x2 + 7x + 12) - (3x2 - 6x - 7)
A. 3x2 + 13x - 19 B. 3x2 + 10x + 5 C. 3x2 + 13x + 5 D. 3x2 + 13x + 19
Simplify.(z9x9)-5
A. 
B. 
C. z4x4
D. z14x14
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 781. Find a linear equation, in slope-intercept form, that relates the score, y, to the number of hours spent in the review course, x.
A. y = -4.025x + 499.25 B. y = 3.6225x - 503.25 C. y = 4.025x + 499.25 D. y = 3.6225x + 503.25