Answer:
Step-by-step explanation:
A variable is a number that is not known yet. It is usually represented by a letter.
A. 13 - x = 9......the variable here is x
B. ? + 7 = 12.....not 100% sure on this one, but the question mark is in place of an unknown number...so I guess this can be used for a variable.
C and D do not contain any variables
6 just search it up on safari lolol
Hi! I'm happy to help!
To solve this, we first need to look at the perimeter equation:
P=2L+2W
We don't know our length, so we can represent it with x. Since our width is 2 feet shorter than x, we can represent it with x-2. Now, we plug these values into our equation:
56=2x+(2(x-2))
Let's simplify what the width is by multiplying:
56=2x+2x-4
Now, let's combine our 2xs
56=4x-4
Now, we just need to solve for x in order to find our length and width.
First, we need to isolate x on one side of the equation. We can do this by adding 4 to both sides:
56=4x-4
+4 +4
60=4x
Now, all we have to do is divide both sides by 4 and x will be fully isolated:
60=4x
÷4 ÷4
15=x
Now that we know x, let's plug this into our previous equations:
L=x=15
<u>L=15</u>
W=x-2=15-2=13
<u>W=13</u>
To verify our answers, we can plug this into our perimeter equation:
56=2(15)+2(13)
56=30+36
56=56
After double checking our answers, we know that our length is 15 and our width is 13.
I hope this was helpful, keep learning! :D
This problem is an another case which makes use of the concept of ratio and proportion. The ratio $2.52 per 0.5 gal should be proportional to the price of 4 gallons of milk. Let x be the price,
($2.52 / 0.5 gallon) = (x / 4 gallons)
The value of x is 20.16. Hence, the price of 4 gallons of organic milk is $20.16.
Let's see what we know:
<span>
the car wash can wash 50 more cars per week at an average of $5 per
wash. The owner will pay the worker $9 per hour for 30 hours per week.
So, the total additional earnings for the car wash will be: 50*5=250 dollars.
But the additional costs, will be: 9*30=270
so it seems that the car wash would spend more than earn - not a good decision for business! so the correct answer is:
b. The owner will not hire the worker because the marginal costs of $270
per week are greater than the marginal benefits of $250 per week</span>