Answer:
<h2><u>7</u>x - <u>7</u>y + <u>21</u> </h2>
Step-by-step explanation:
7(x - y + 3)
=> 7 × x - 7 × y + 7 × 3
=> <u>7</u>x - <u>7</u>y + <u>21</u>
Answer:

Step-by-step explanation:
According to the First Law of Thermodynamics, the heat received by the metal cylinder is equal to the change in the internal energy. That is:


The specific heat is clear in the previous expression and finally computed:



Answer: 750 miles
Step-by-step explanation:
The gas mileage is 75 miles per 1/2 gallon of gasoline.
First find how many miles it can go on 1 gallon of gasoline:
= 75 ÷ 1/2
= 150 miles
If the scooter can go 150 miles on 1 gallon, the number of miles it will go on 5 gallons is:
= 5 * 150
= 750 miles
We know that 4 cans of coffee cost $1.60. So, if we divide that number by 4, we get

Now we can simply repeat this process again: if we divide both sides by 4, we get
