In your equation: a+(-4)=-13
you then add four to each side,
so a= negative 13 plus 4
so a= -9
♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️



♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️
Mean, in terms of math, is the total added values of all the data in a set divided by the number of data <em>in</em> the set. Make sense? If not, here' an example...
Let's say this is my data set:
1, 2, 5, 4, 3, 8, 7, 4, 6,10
To find the mean...
Step 1: Add all of them together.
1+2+5+4+3+8+7+4+6+10 is what? 50. Now that you have this number...
Step 2: Divide by the amount there are. Basically, count up all of the numbers. How many are there? There are 10. Finally...
Step 3: Divide. 50/10 is 5, so the mean of this data set would be 5. Get it? I sure hoped this helped :)
Answer:
110 is the answer because 10 tens equal 100 and 10 ones equal 10
Step-by-step explanation:
The answer is a. increase energy efficiency. This means that we now use less energy to do more thanks to many advances in technology. It could also be due to the use of alternative sources of power such as the sun or win. These new sources provide energy without causing pollution.
tbh google