How to subtract and add polynomials

A 120-gallon vat initially contains 90lb of salt dissolved in 90 gallons of water. Brinecontaining 2 lb/gal flows into the vat at a rate of 4gal/min. The water in the vat is kept well mixed, and the mixture is removed at the rate of 3 gal/min.

If 48% of the students have pets at home, what percentage does not have pets at home?

How to add fractions?

Which one is the greater quantity 1/3 of a box of corn crinkles or 50% of a box of corn krinkles

What is the greatest common factor of 36 and 63? (A) 3 (B) 6 (C) 9 (D) 18

A printer takes 5mins to print 90 copies of a repor. At this rate, how many copies of the same report can it print in 1/2 hours

What are the coordinates of the vertex of the graph of the function y=-x^2+6x-11 the options are: (3,-2) (3,16) (-3,-29) (-3,-20)

The annual amount A (in billions of dollars) Americans spent on meals and beverages purchased for the home for the years since 2000 can be modeled by A (C) - 286 + 880 where t represents the year, with t = 3 corresponding to 2003.

Carol is sixty-six inches tall. This is twenty inches less than two times Mindy's height. How tall in Mindy?

Assume running consumes 108 calories per mile. If you run 11 - minute mile what is your average power output, in watts, during a 2-hour run?