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Posted by **rr** on Tuesday, May 15, 2012 at 3:09am.

8x^5 - 7x^9-7x^5+ 8x^9

- algebra -
**MathMate**, Tuesday, May 15, 2012 at 5:09amLike terms are terms with the same variables raised to the same powers.

8x^5 - 7x^9-7x^5+ 8x^9

First groupe like terms and arrange in descending order

= 8x^9-7x^9 + 8x^5-7x^5

Now the simplification

=x^9 + x^5

- algebra -
**rr**, Tuesday, May 15, 2012 at 6:47amTHE 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=314.28x-0.1x^2. What is the total revenue from the sale 0f 135 washing machines.

- algebra -
**MathMate**, Tuesday, May 15, 2012 at 8:44amTry to start a new post for a new question. Sometimes these piggy-backed 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

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