Engineering students at Lancaster College last year received an average of $6,400 in scholarships and grants. This year, the average is $1,344. What is the percent of decrease in the average amount?

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

The ratio of the perimeters of two similar triangles is 4: 3. what are the areas of these triangles if the sum of their areas is 130cm2?

The temperature of a chemical solution is originally 21 ? c . a chemist heats the solution at a constant rate, and the temperature of the solution 75 ? c after 1212 12 minutes of heating. the temperature, tt t , of the solution in ? c is a function of x , the heating time in minutes. write the function's formula.