Anumber is randomly selected from {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. a is represented by the event that the number picked is greater than 7. what is the probability of the complement of event a?
a.3/10
b.2/5
c.3/5
d.7/10

x = 25

step-by-step explanation:

a^2+b^2=c^2

7^2+24^2=c^2

49+576=625

sqrt625=25

x=25

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a