What the answer to 66.15 ÷ 0.63

What is the value of r of the geometric series?

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.

Which expression is the factorization of x^2+10+21