Answer:
You should have 9.
Step-by-step explanation:
In this problem, we are trying to find the equivalent of 18+45.
18 plus 45 is 63. In order to get the second problem to also equal to 63, we have to find the number to multiply 2 and 5.
So to do this, you have to find a number that can both be multiplied by 2 and 5 to add up and get 63.
----------------------------------------------------------------------------------------------------------
Let's try 4.
4(2+5)=
8+20=28. This will not work.
----------------------------------------------------------------------------------------------------------
Let's try 7.
7(2+5)=
14+35=49. This will not work.
----------------------------------------------------------------------------------------------------------
Let's try 8.
8(2+5)=
16+40=56. This will not work.
----------------------------------------------------------------------------------------------------------
Let's try 9.
9(2+5)
18+45=63. This works.
----------------------------------------------------------------------------------------------------------
Now that we know that 9 is the missing number, let's check our problems:
18+45=63
9(2+5)= 18+45= 63.
----------------------------------------------------------------------------------------------------------
I hope this helps!
-No one
