The first row of a conference hall has 8 chairs and 2 additional chairs in each subsequent row. How many chairs are in the 9th row? How many chairs in total are in the first 9 rows?

Tennis ball regression

What would be the value of x in x+5=-3x-9

Students in a class were asked to tell their favorite color purple: 14% green: 16% yellow: 4% blue: 40% red: 26% how many times more students said red than yellow?

Y varies inversely with x. if y = 40 when x = 16, find x when y = -5

in september 2007, the average price of gasoline was $2.81 a gallon. This price represented an increase of $2.31 less than twice the price the previous year. Use the equation 2.81 = 2x - 2.31 to determine the price of gasoline in September 2006.

A music competition on television had five elimination rounds. After each elimination, only half of the contestants were sent to the next round.

What is the solution of - 8x - 5+3x=7+4x - 9

A sprinkler head had a 90-degree rotation and shoots 15 feet long. How much area is covered if there are 12 90-degree heads in one yard? How many 90-degree head do you need to cover a 1200 square foot yard?

Tell whether the number is written in scientific notation 7.814*10^-36

Which equation has the same solution 2x²+16x-10=0 a. (x+4) ² = - 3 b. (x+4) ² = - 11 C ... (x+4) ² = 13 d. (x+4) ² = 21