Answer:

Step-by-step explanation:
Given
x -
= 9 ← square both sides
(x -
)² = 9²
x² - 2 +
= 81 ( add 2 to both sides )
x² +
= 83
Now
(x +
)² = x² +
+ 2, thus
x² +
= 83 + 2 = 85
(x +
)²= 85 ( take the square root of both sides)
x +
= 
He would drive 585 miles in 13 hours
There are many ways to find the answer. One of them is to find how long does it take to make one part and then divide 25.8 by the result:
5.4 ÷ 9 = 0.6 (that's how long does it take to make one part)
25.8 ÷ 0.6 = <u>43</u> (that's how many parts can be made in 25.8 hours)
Answer to ur division question is 6,986