Answer: Pretty sure it's A
Step-by-step explanation: If you find the square root of 282 you get 16.7
F(x) = | 4x - 1 | .....when f(x) = 7
7 = | 4x - 1 |
4x - 1 = 7 -(4x - 1) = 7
4x = 7 + 1 -4x + 1 = 7
4x = 8 -4x = 7 - 1
x = 8/4 -4x = 6
x = 2 x = -6/4
x = - 3/2
solutions are x = -3/2, 2
P(not a birthday card) is

(

) because if 14 of the 21 are birthday cards then 21-14=7 are not.