X^2+y^2=49, y=7-x solve it in substitution

A ratio of science books to art books is 2:5. 20 % of the books were unsold and 2240 were sold. total amount of each book?

In a 3 year period, a city's population decreased by 7525 to about 581,000. what was the city's population at the beginning of the 3 year period?

To calibrate the x-axis for 14c decay, you have to convert half-lives to number of years. recall that 14c has a single half-life of 5,730 years. how many years make up 5 half-lives for 14c?

A movie complex is showing the same movie in three theatres. In theatre A, 112 of the 160 seats are filled. In theatre B, 84 seats are filled and 56 are empty. In theatre C, 63 of the 180 seats are empty.

A circle is cut from a square piece of cloth, as shown: How many square inches of cloth are cut from the square? (π = 3.14) 1,017.36 in2 1,182.96 in2 1,276.00 in2 1,489.24 in2

In a class of all girls 24 of the 30 students have brown hair what is the probability of randomly picking a girl with brown hair

The slope of the line whose equation is 8y = 2x 4

Original price of a book: $15.50 discount is 10%

Bee Paul, store manager for Jay's Appliance, is having a difficult time placing a selling price on a plasma television that originally costs $600. Bee knows his boss would like to have a 55 percent markup based on cost.

A new internet phone company advetises that you can call any country in the world for 3 cent per minute. You regularly call your friend in India and talk to her for 20 minutes. How much would the phone call cost?