Solve the equation for the specified variable.9k + ar = r - 8y for r
A. r = 
or r = 
B. r = 
or r = 
C. r = 
or r = 
D. r = 
or r = 
Answer: B
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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. $4.99
B. $4.89
C. $4.91
D. $4.96
Solve for the base. Round to the nearest cent.Part: $8.92 Rate of increase: 16%
A. $107.69 B. $7.69 C. $10.35 D. $8.92
Find the mean. Round to the nearest tenth unless otherwise stated.Grocery expenses for the past six months: 
, 
, 
, 
, 
, 
style="vertical-align: -4.0px;" />.Round to the nearest cent. A. $84.97 B. $72.97 C. $70.81 D. $106.22
Solve the equation.x2 + 4x = 0
A. {0, 4} B. {0, - 4} C. {- 4} D. {4}