Answer:

Step-by-step explanation:
Use Pythagorean theorem since you have a right triangle
= 
225 = 100 +
so x = 
First you need to know some rules 2 numbers that are the same with coefficients divided : you differentiate those coeff
and multyplied :you sum up them
12x^8/3x^3= 4x^8-3=4x^5
20^2x=20^x*20^x
m^5*m^-7=m^5-7=m^-2
Answer is 40. A triangle equals 180 so all you do is subtract 65 and 75 from 180 to get your answer.
1 and 2 are vertical
3 and 4 are adjacent
9/8 divided by 3/8 is 3 (because of the same denominator look at the first number)
3/5 divided by 2/3 is 0.9 hope this helps