Answer:
4x^2+16x+5
Step-by-step explanation:
(6x^2+7x)+(5-2x^2+9x)
6x^2-2x^2+7x+9x+5
4x^2+16x+5
Answer:
53 days
Step-by-step explanation:
A suitable probability calculator shows the 90th percentile to be 52.8 days, approximately 53 days.
Answer:
62.29%
Step-by-step explanation:
The probability of Aya being offered a coupon on at least one of the six days she visits the website is 100% minus the probability that she is not offered a coupon on any of the six days, which is described by a binomial probability with zero successes in six trials with a probability of succes p = 0.15.

The probability that Aya will be offered a coupon on at least one of the days she visits the website is 62.29%.