The first equation is x = -1
The second and third equations are no solution
The third equation is all rel numbers.
We can tell each one by solving them. In the first one, you get the following.
4 + x = -8x - 5 ----> Add 8x to both sides
4 + 9x = -5 ----> Subtract 4 from both sides
9x = -9 ----> Divide both sides by 9
x = -1
For the middle two, when you attempt to solve, you get untrue statements. This shows there are no solutions. See the example below.
7 + 2x = 2x - 7 ----> Subtract 2x from both sides
7 = -7 (UNTRUE)
And for the last one, each term cancels out, which shows that we have all real solutions.
-3x + 3 = 3( 1 - x) ----> Distribute the 3
-3x + 3 = 3 - 3x ----> Add 3x to both sides
3 = 3 (TRUE)
Eight hundred four thousand six.
Average cost per mile is $0.6
<h3>How to calculate the average cost per mile?</h3>
To calculate the average cost per mile that Kiara had to pay, we perform the following operations:
We add up all the payments Kiara made related to her car.
- $3,060 + $94 + $128 + $1,080 + $290 + $398 + $1,520 + $930 = $7,500
Later we divide the total value, in the number of miles traveled by Kiara
- $7,500 ÷ 12,500 miles = 0.6
Learn more about average in: brainly.com/question/2426692
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