Yes his equations are correct
I think if I do this correctly, the answer is x<-1
Rounding to the nearest ten:
28 → 30
188 → 190
250 → 250
101 → 100
122 → 120
The answer is P, because if both triangles are right angled and have the angle of 70°, then because angles in a triangle equal 180° you can say that they will be the same as 70 + 90 = 160, and 180 - 160 = 20, which is the same steps for both triangles. I hope this helps! Let me know if I need to explain it further or anything :)
