algebra
posted by rr .
collect like terms and then arrange in descending order.
8x^5  7x^97x^5+ 8x^9

Like terms are terms with the same variables raised to the same powers.
8x^5  7x^97x^5+ 8x^9
First groupe like terms and arrange in descending order
= 8x^97x^9 + 8x^57x^5
Now the simplification
=x^9 + x^5 
THE total revenue is the amount of money tsken by a business. Appliance firm determines that when it sells y washing machine, the total revenue R in dollars is given by the polynomial R=314.28x0.1x^2. What is the total revenue from the sale 0f 135 washing machines.

Try to start a new post for a new question. Sometimes these piggybacked questions get forgotten.
I will answer it this time.
R is a function of x. So substitute 135 for x to get
R=314.28*135  0.1*135²