Will give extra points and brainliest /:

-1 +- sqrt (1^2 -4(2)(-4))

2(2)

-1 +- sqrt(1+32)

4

-1 +-sqrt(33)

4

8

step-by-step explanation:

this is a subtraction problem.

10 - 2 = 8

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.