Answer:
20:a , a=48
Step-by-step explanation:
5*4=20, 12*4 = 48
Simple mathematics, you multiple 5 by 4 to get 20, do the same thing to 12.
Answer:

Step-by-step explanation:
We want to solve for b² in

Combine terms containing b²

Factor b² to get:

Divide by a² -2b²

Answer: Rhumbus
Step-by-step explanation:
If you draw the points on a graph, you can see that it's a rhumbus
X=55, since straight lines are 180°. Y=70, since the triangle is isosceles, and the 2 bottom Angles are equal. Z=125, since the 2 opposite angles(x and y) add up to 125°