Determine graphically the x-value when y = 6 in the given equation.y = - 
x
A. -3;
B. -2;
C. -18;
D. 6;
Answer: C
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Multiply and simplify.
? 
A. 1
B. 
C. -1
D. 0
At a time t seconds after an object is tossed vertically upward, it reaches a height s in feet given by the equation:
?
?
What is the maximum height reached by the object?
?
A. 5 ft B. 400 ft C. 800 ft D. 10 ft E. 300 ft
Use a graphing calculator to plot the data and find the quadratic function of best fit.A small manufacturing firm collected the following data on advertising expenditures (in thousands of dollars) and total revenue (in thousands of dollars). Find the quadratic function of best fit. Round values to the nearest thousandth. 
A. R(x) = -0.310x2 + 2.631x + 6128.455 B. R(x) = -0.0242x2 + 7.139x + 6209.323 C. R(x) = -0.015x2 + 4.536x + 6123.841 D. R(x) = -0.091x2 + 5.952x + 6337.167
Subtract.55.69 - 31
A. 24.69 B. 24.79 C. 25.19 D. 86.69