Class A was given a sunflower with a height of 8 centimeters that grows at a rate of centimeters per week. Class B was given a sunflower with a height of 10 centimeters that grows at a rate of centimeters per week. After how many weeks are the sunflowers the same height?

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?