Answer:
81 mm
Step-by-step explanation:
Now: 1 mm
In 10 minutes: 3 * 1 mm = 3 mm
In 20 minutes: 3 * 3 mm = 9 mm
In 30 minutes: 3 * 9 mm = 27 mm
In 40 minutes: 3 * 27 mm = 81 mm
Answer: 81 mm
-3x+3c+5d-d
=0+4d
=4d
x = 21
3x + 18 + 4x + 15 = 180
7x + 33 = 180
7x = 147
no
the graph should be facing up.