68. Post office A local post office weighs outgoing mail and finds that the weights of first-class letters are approximately Normally distributed with a mean of 0.69 ounce and a standard deviation of 0.16 ounce. a. Estimate the 60th percentile of first-class letter weights. b. First-class letters weighing more than 1 ounce require extra postage. What proportion of first- class letters at this post office require extra postage?

Solve the system of equations. y= 2x y= x^2 - 15

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.

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n