collect like terms and then arrange in descending order.

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

Like 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

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=314.28x-0.1x^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 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

Arrange the given numbers in descending order.

4
5
0.09

4

9

2
4

pls help

To collect like terms, you need to combine the terms that have the same variable with the same exponent.

Let's start by combining the terms with an exponent of 9:
-7x^9 + 8x^9 = x^9

Next, let's combine the terms with an exponent of 5:
8x^5 - 7x^5 = x^5

Now we have two combined terms:
x^9 + x^5

To arrange them in descending order, we list the terms from highest to lowest exponent:
x^9 + x^5

So, the expression with like terms collected and arranged in descending order is x^9 + x^5.