Answer:

Step-by-step explanation:
A) 604.2
B) 609.9
C) 537.42
D) 542.49
A.) Mark is correct as every increase in x of 2 equals a y increase of 4
Answer:
A=61, B=74
Step-by-step explanation:
Because all the angles in a triangle add up to 180:
(2x+4) + (2x-9) + x = 180
If you solve that for x, you will get that x=35. Now you just plug in x to the angles A and B.
Move 12 to the other side, making it negative
h=31-12
h=19