Find the focus and directrix of the parabola with the given equation.- 
x2 = y
A. focus: (-16, 0)
directrix: x = 8
B. focus: (0, 8)
directrix: y = -8
C. focus: (0, -8)
directrix: y = 8
D. focus: (0, -8)
directrix: y = -8
Answer: C
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Find the quantity if v = 5i - 7j and w = 3i + 2j.
A. 2
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B. 
C. 
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D. 
Find an equation of the line, and write it in (a) slope-intercept form if possible and (b) standard form.Through (8, -4); vertical
A. (a) y = 8 (b) y = 8 B. (a) y = -4 (b) y = -4 C. (a) not possible (b) x = 8 D. (a) not possible (b) x = -4
Use a calculator to find the following. Round the answer to four places past the decimal point. ? cos 81.4°
Fill in the blank(s) with the appropriate word(s).
Write each rate as a unit rate as a phrase, and determine which is a better buy.A 20-ounce bottle of pop costs $1.80. A 32-ounce bottle of pop costs $2.24.
A. 20-ounce bottle: $0.91 per ounce; 32-ounce bottle: $1.07 per ounce. The 20-ounce is the better buy. B. 20-ounce bottle: $0.07 per ounce; 32-ounce bottle: $0.09 per ounce. The 20-ounce is the better buy. C. 20-ounce bottle: $0.09 per ounce; 32-ounce bottle: $0.07 per ounce. The 32-ounce is the better buy. D. 20-ounce bottle: $0.20 per ounce; 32-ounce bottle: $0.07 per ounce. The 32-ounce is the better buy.