1) <span>30x4 − 20x3 + 15x2
This is the answer to 1. Don't forget to rearrange the terms in ascending order. That can trip people up.
2) </span><span>x3 + 8x2 + 13
Don't forget to check the terms sign. The subtraction symbol switches them all. </span>

<u>Step-by-step explanation:</u>
Here , we have In August, Cory begins school shopping for his triplet daughters. One day, he bought 10 pairs of socks for $2.50 each and 3 pairs of shoes for d dollars each. He spent a total of $135.97. We need to find What does d equal . Let's find out:
One day, he bought 10 pairs of socks for $2.50 each
Following is the equation for this info:
⇒ 
⇒ 
3 pairs of shoes for d dollars each
Following is the equation for this info:
⇒ 
⇒ 
He spent a total of $135.97
Following is the equation for this info:
⇒ 
⇒ 
⇒ 
⇒ 
Therefore ,
.
Answer:
(4a + 7b)(16a² - 28ab + 49b²)
Step-by-step explanation:
Use the sum of two cubes to factor
In addition
a³ + b³ = (a + b)(a² - ab + b²)
In subtraction
a³ - b³ = (a - b)(a² + ab + b²)
64a³ + 343b³ = (4a + 7b)(16a² - 28ab + 49b²)