Solve the problem. Round to the nearest tenth if necessary.On a biology test, a student got 25 questions correct but did not pass. On a second attempt, the student got 35 questions correct. What was the percent of increase?
A. 40%
B. 10%
C. 60%
D. 28.6%
Answer: A
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Solve the problem.Wind speed varies in the first twenty meters above the ground. For a particular day, let 
compute the wind speed 
above the ground. What is the wind speed 
above the ground? Round results to the nearest hundredth.
A. -1.77 meters per second B. 7.98 meters per second C. 8.06 meters per second D. 9.23 meters per second
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 red sticker.Use the fact that for A = 
, A-1 = 
.
A. $6.50
B. $6.99
C. $6.87
D. $6.79
Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. 
C. 
D. 
Let X = {l ? Z | l = 5a + 2 for some integer a}, Y = {m ? Z | m = 4b + 3 for some integer b}, and Z = {n ? Z | n = 4c ? 1 for some integer c}.
(a) Is X ? Y ? (b) Is Y ? Z? Justify your answers carefully. (In other words, provide a proof if the statement is true or a disproof if the statement is false.)