Answer:
7.2%
Step-by-step explanation:
Given data
Estimate=450miles
Actual= 485 miles
%error= actual-estimate/ actual*100
%error=35/ 485*100
%error=0.072*100
%error=7.2%
<u>Answer: </u>
Simplified form of given expression (2x – 9 )( x + 6 ) is 
<u> Solution:
</u>
We need to simplify following expression.
(2x – 9) ( x + 6)
For sake of simplicity lets first assume 2x – 9 = A
So expression becomes A(x+6)
= Ax + A6
Now replace A by 2x – 9
= (2x – 9 ) x + (2x – 9 ) 6

On simplification, we get

Hence simplified form of given expression (2x – 9 )( x + 6 ) is 
B if you need an explain I can do it
Answer:
Step-by-step explanation:
Let the number = x
3x + 9 = 2x - 6 Looks like you are going to get something negative here.
Subtract 2x from both sides.
3x - 2x + 9 = 2x - 2x - 6
x + 9 = -6
Subtract 9 from both sides.
x + 9 - 9 = - 6 - 9
Combine
x = - 15