How do i write this in standard form?

What is the area of the trapezoid shown ?

If you flip a coin 3 times, what is the probability of flipping heads 3 times? a. p(3 heads) = 3/8 b. p(3 heads) = 1/6 c. p(3 heads) = 1/8 d. p(3 heads) = 1/2

Which of the following is the sum of 3 1/6 + 6 3/8?