What is the value of x in the equaton

How can we find the measure of an exterior angle if we know the measurement of an interior angle

Which of the following statement about pascal's triangle are true?

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21