Solve the problem.Find the direction in which the function is increasing or decreasing most rapidly at the point p.f(x, y) = xy2 - yx2, p = (2, -1)
A. 
i + 
j
B. 
i + 
j
C. 
i + 
j
D. 
i + 
j
Answer: C
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For the given angle in standard position, designate the quadrant in which the terminal side lies.-123°
A. III B. I C. II D. IV
Solve the problem.A controlled placebo experiment is said to be double-blind when
A. the members of the control group are told they are in the treatment group and vice versa. B. none of the scientists conducting the study know which patients are in the control group and which patients are in the treatment group. C. neither the members of the control group or the members of the treatment group know to which of the two groups they belong. D. neither the subject nor the scientists conducting the study know which individuals are in the treatment group and which are in the control group. E. none of these
Solve the problem.A bookstore is having a sale. All books included in the sale have a colored sticker on them to indicate the sale price. There are green stickers, red stickers, and orange stickers. Bob, Sue, and Fred each make purchases of books that are on sale. Each row of the table gives information about the numbers of book purchases and the total cost of the purchase (before taxes).
Use this information to set up a matrix equation of the form 
which can be solved to determine the price for each type of sale book. Solve this matrix equation to find the price of a
book with a green sticker.Use the fact that for A = 
, A-1 = 
.
A. $4.96
B. $4.91
C. $4.89
D. $4.99
Solve.The equation of a line is y = 
x - 1. What is the slope of a line perpendicular to it?
A. 
B. - 
C. - 
D. 