A rectangle has a width of x centimetres and a perimeter of 8x centimetres. A square has sides of length one fourth the length of the rectangle.

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?