A New Internet Study looked at the texting habits of cell phone owners. The study reported that in 2011, cell phone owners between the ages of 18 and 24 exchanged an incredible 3200 texts per month. Back in 2009, a Nielsen study found that the same age range averaged 2899 texts per month.* What was the relative change in the number of text messages sent from 2009 to 2011?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

What is the y intercept of f(x)=(1/2)^x?

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters