8 days because 4/5 = 8/10 and he is using 1/10 a day.
Https://photomath.net/s/rRVj6K
Answer:
X=75
Y=110
Step-by-step explanation:
A straight line is 180, so add the equations that make a line and set them equal to 180
x+20+x+10=180
Combine like terms
2x+30=180
Subtract 30 from both sides
2x=150
Divide by 2
X=75
Same for y
y+y-40=180
2y-40=180
Add 40 to both sides
2y=220
Divide by 2
Y=110
Answer:
150°
Step-by-step explanation:
180-30=150...............