The answer is 9, you have to add them together which equals 9.
Let there be two variables: t and o where t is for ten digit and o is for one digit:
So we have two equations:
t = 2o (1)
t+o = 12 (2)
Subtract (2) from (1) and we get o = 12-2o
Now solve for o:
3o = 12
o = 4
Now plug in (1) or (2) and we have t = 8
Therefore our number is 10t + o = 84
Answer:
1078
Explanation:
For this you can use a proportion to solve. So first we set up the proportion as laptop over desktop is equal to "<em>l</em>" over total desktop computers. Let <em>l</em> be the total amount of laptops which is what we must first solve for.
Then we cross multiply.
Now we can solve it as a regular algebra problem,
Now that we know how many laptop computers there are we can find the total number of computers in the school. We simply add the total number of desktop computers to the total number of laptop computers.
And that is the answer. 1078.
Answer:
The answer is the last one.
Step-by-step explanation:
Firstly, look at the first inequality and we get , so . In the second inequality, we have , so . Together, we know that the answer is the last one.