No heat, difficult access

You see, that's my scuttle hole over there. Here's my air handler, and it's facing the wrong way. So we got to get over here and see why the heat's not working. I gotta I can't even hardly see what's back there. Between red and white, I showed 24 volts. I'm gonna go see if we can jump it out and see if it'll come on. I jumped from red to white. I heard the heat come on. Let's go check it. That heat problem was the thermostat, but it looks like blue on the thermostat was common. I've got to check my wires here. See, I'm in a tight spot right here. Not the best working conditions, but the problem is the thermostat and we'll get that replaced. At this point, we should be asking ourselves if we can reduce this fraction. And since we can't identify a common factor between... Yeah, I made a lot of money. Is that it the next time? We can't reduce it further. Alright, so for B... You can see that we have one half plus one fourth that is required to add two fractions that have different denominators, denominators two here and four here. In order to proceed, we have to rewrite these fractions such that they're over the same denominator. One way people go about doing this is by identifying the least common multiple of the denominators. To do that, they put down the factors of the denominator, so we have the denominator of 2, its multiples are 2, 4, 6, 8, 10, and 12, to the denominator of 4, which will be due to the denominator. So, 1 half rewritten with a denominator of 4 is 2 over 4. Again, 1 fourth already has a denominator of 4. That's a denominator of 1 fourth over here. And then, like we did previously, all we do is keep the denominator the same. 8 over 12 minus, again, we don't have to rewrite this one at all since it's already over 12. 8 over 12 minus 1 over 12 equals 7 over 12. At this point, we should be looking to reduce this fraction. That said, there are no common factors between seven. Well, so it's in simplest form. Again, just to recap, in order to add and subtract fractions, the fractions have to have the same. I'm still not done with that one. I gave him a filter. He's got eight, but he hasn't changed the filter since the last time I was there, and I wasn't there. It's been six months since I was there, You can imagine what the filter looks like. It's going to be a good time to have.