Answer: The probability that a value is less than 36.8 is 0.9993.
Step-by-step explanation:
Let X be the random variable that normally distributed.
Given: 
The probability that a value is less than 36.8 = 
[Using P-value calculator]
Therefore, The probability that a value is less than 36.8 is 0.9993.
A triangle with sides measuring 300, 400 and 700 because 300+400+700=1400 which is higher than the first triangle 300+400+500=1200
I am not sure about that but your answer might be x=3 and y=0
Hope it helps : )