Ab≅rtand ab=45. if rt=3(x+9), what is the value of x?

You know that AB = RT. You also know that AB = 45, and that RT = 3(x+9). Therefore, you can take the following steps.
AB = RT
Use substitution to get 45 = 3(x+9)
Divide both sides by 3 to get 15 = x + 9
Subtract 9 from both sides to get x = 6
That is your answer. I hope it helps!

How am i supposed to know your lecture

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!