9. Solve the given system. 4x - 5y = 40
x = 3y + 24

A. (0,8)

B. (8,0)

C. (-8,0)

D. (0, -8)

D.(0,-8)

Step-by-step explanation:

answer:
Hence, the probability that seven or more of them used their phones for guidance on purchasing decisions is 0.7887              
Step-by-step explanation:
We are given the following information in the question:
We treat people using phones in the store for guidance  as a success.
P(People use phone for guidance) = 57% = 0.57
Then the number of people follows a binomial distribution, where
Formula:

where n is the total number of observations, x is the number of success, p is the probability of success.
Now, we are given n = 14 and x = 7
We have to evaluate:

Hence, the probability that seven or more of them used their phones for guidance on purchasing decisions is 0.7887