Answer:
y=55
Step-by-step explanation:
First take note a triangle is always equal to a total of 180 degrees
now setup the equation.
y+40+y+30=180
rid of alike terms
70+2y=180
Now subtract 70 from both sides
2y=110
Now divide both sides by 2
y=55
Answer:
0.5 liters of milk are available per child.
Step-by-step explanation:
Amount of milk available per children:
The amount of milk, in liters, available for x children is given by:

50 children are present on a day
This means that 
How much milk is available per child?
This is m(50). So

0.5 liters of milk are available per child.
1) At 95% Confidence interval the critical value is z0.025= 1.96 Margin of error = 0.02 Or, z0.025* sqrt(p(1 - p)/n) = 0.02 Or, 1.96 * sqr
I think you can put bench mark place valie round tenth thousnadth