Answer:
159
Step-by-step explanation:
k (9) = (2 * ) - 3
= (2 * 81) - 3
= 162 - 3
= 159
200m^2-800n^2=200(m^2-4n^2)
2x + 70 = 110
x = 20
180-110 = 70
70 + 20 + y = 180
y =90