Provide an appropriate response.Do a horizontal line and a vertical line intersect? If so, what kind of angle is formed by their intersection? Explain.
What will be an ideal response?
Yes. The angle is a right angle of 90°. The lines
intersect because they are perpendicular to each other.
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Provide an appropriate response.True or false? The parametric equations x = t3, y = t3 - 8 will graph a circle.
A. True B. False
Danny and Stacey have gone from the swing to the slide at the park. The slide is inclined at an angle 
. Danny weighs 39.0 pounds. He is sitting in a cardboard box with a piece of wax paper on the bottom. Stacey is at the top of the slide holding on to the cardboard box. Find the magnitude of the force Stacey must pull with, in order to keep Danny from sliding down the slide. (We are assuming that the wax paper makes the slide into a frictionless surface, so that the only force
keeping Danny from sliding is the force with which Stacey pulls.)
?
?
A. 37.8 lb
B. 31.1 lb
C. 26.5 lb
D. 22.7 lb
E. 29.8 lb
Graph the solution of the system of linear inequalities.
A. 
B. 
C. 
D. 
Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = -2x2 + 5x + 9
A. Increasing on (-?, 0); decreasing on ( 0, ?)
B. Increasing on (-?, 1); decreasing on ( -1, ?)
C. Increasing on 
; decreasing on 
D. Increasing on 
; decreasing on 