I need help on this please? It is ratios.

X+ y = 5 ; x - y =3 solve using linear combination

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no