What is the middle number between 2 and 2.5?

2.25

Step-by-step explanation:

To find the middle number—of any 2 numbers—is to add them together, then to divide it by 2. We do this because when you add them toher and divide them by 2, you get the exact middle number that follows.

So, we can do the same for 2 and 2.5.

2+2.5=4.5

Now we divide it by 2 to get the middle number.

4.5 divided by 2 = 2.25

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.