For a special concert by a popular band, the concert hall owner decided to charge $20 per ticket for the first r rows and 15 for the remaining rows. suppose r=16 find the revenue for just the front r rows if all of seats in those front r rows were all sold.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.