What important information must be included to find a sum of a series?

Important information like the common difference, 1st term, the # of terms; the last term must be included to find the sum of a series.

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.

d≈7.07in

step-by-step explanation: