Given positive integers x and y such that x does not equal y and 1/x+1/y=18, what is the smallest possible value for x + y?

The long jump record, in feet, at a particular school can be modeled by f(x) = 19.6 + 2.5ln(x + 1) where x is the number of years since records began to be kept at the school. what is the record for the long jump 11 years after record started being kept? round your answer to the nearest tenth.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Mr. roseanne will buy 12 1/2 pounds beef for for a cookout. the price for the first 3 pounds of beef is $4.99 per pound. after that, the price is $4.49 per pound. how much will mr.roshan pay for the beef