What does it mean when there is a 3 around a square root sign?

Acourgette seed and a pumpkin seed is planted p(courgette seed germinates) 4/5 and p(pumpkin seed germinates) = 1/6 what is the probability that both seds germinate

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

Janice determined there were 10 possible outcomes when tossing two coins and spinning a spinner numbered 1 through 6. what is the correct number? what might have been janice's error?