Let

denote the event that a student is a freshman,

a sophomore,

a junior, and

a senior.
Let

denote the event that a student majors in engineering. By the law of total probability,

By the definition of conditional probability, we can expand each of these intersection probabilities to get

X = 27
Explanation:
x = y times 3
540 because if you add 329 1/4 and 210 1/4 it’s 540. You add these together because you need to know the COMBINED distance between the dolphin and seagull.
Perimeter is the sum of all the sides of the shape
do you know the length of each side of the parallelogram?