Explain what H means, and why 10H + 6 - 5H + 3 is a simplified expression of
5H + 9 ?

H is the group 10H and -5H is in.

Step-by-step explanation:

When you are doing this equation you classify group by their variables. If they do not have a vairable they are called "constants". It is a simplified version of 5h + 9, this is because of the way you do the problem. You are going to add 3 + 6.  Then you are going to add 10H + ( - 5H ). So you are going to end up with 5H and 9 from your equations. Now you are going to form the equation 5H + 9.

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

i need points

step-by-step explanation:

sorry bubs