If the average (arithmetic mean) of 5 numbers ~$j$~, ~$j + 5$~ ,  ~$2j - 1$~ , ~$ 4j - 2$~ , and ~$5j - 1$~  is 8, what is the value of ~$ j$~ ?

The maximum recommended pulse rate R, when exercising, for a person who is x years of age is given by the equation ~$ R = 176 - 0.8x.$~ What is the age, in years, of a person whose maximum recommended pulse rate when exercising is 140 ?

Of the following, which is least?

A group of store managers must assemble 280 displays for an upcoming sale. If they assemble 25 percent of the displays during the first hour and 40 percent of the remaining displays during the second hour, how many of the displays will not have been assembled by the end of the second hour?

Company C produces toy trucks at a cost of $5.00 each for the first 100 trucks and $3.50 for each additional truck. If 500 toy trucks were produced by Company C and sold for $10.00 each, what was Company C's gross profit?

To order certain plants from a catalog, it costs $3.00 per plant, plus a 5 percent sales tax, plus $6.95 for shipping and handling regardless of the number of plants ordered. If Company C ordered these plants from the catalog at the total cost of $69.95, how many plants did Company C order?

If x > y and y > z, which of the following represents the greatest number?

What is the value of ~$x^2yz - xyz^2$~, if ~$ x = -2$~,~$ y = 1$~, and ~$z = 3$~ ?

Points A, B, C, and D, in that order, lie on a line. If~$ AB = 3 cm$~, ~$AC = 4 cm$~, and~$ BD = 6 cm$~, what is CD, in centimeters?

If ~$ x + y = 2$~ and ~$ x^2 + y^2 = 2$~, what is the value of xy ?