What is the sum ofthe different positive prime factors of 550 ?

If ~$x^{4}+y^{4}=100$~, then the greatest possible value of x is between

At a certainuniversity, the ratio of the number of teaching assistants to the number ofstudents in any course must always be greater than 3:80. At this university, what is the maximumnumber of students possible in a course that has 5 teaching assistants?

A furniture dealer purchased a desk for $150 and then setthe selling price equal to the purchase price plus a markup that was 40 percent of the sellingprice. If the dealer sold the desk atthe selling price, what was the amount of the dealer's gross profit from thepurchase and the sale of the desk?

$$\frac{1+0.0001}{0.04+10}$$

The value of theexpression above is closest to which of the following?

If ~$xy=1$~, what is the value of ~$\frac{2^{\left ( x+y \right )^{2}}}{2^{\left ( x-y \right )^{2}}}$~ ?

38, 69, 22, 73, 31, 47, 13, 82

Which of the following numbers is greater than three-fourths of the numbers but less than one-fourth of the numbers in the list above?

There are 10 childrenin a company's day-care center, and a pair of children is to be selected toplay a game. At most, how many differentpairs are possible?

If ~$a> b> 0$~, then ~$\sqrt{a^{2}-b^{2}}$~ =

In a certain game,the units of currency of three countries are the crown, the shield, and thepound, respectively. If 2 crowns equal 3shields and 3 shields equal 4 pounds, how many crowns equal 18 pounds?