please i need help...I will give brainilist for good and correct answer.

25 minutes

Step-by-step explanation:

median before = 53

median after = 28

53-28 = 25

Other info

The median marks the mid-point of the data and is shown by the line that divides the box into two parts (sometimes known as the second quartile). Half the scores are greater than or equal to this value and half are less.

The difference of the set of median shown = 25 minutes.

a(n) = (3/5)a(n-1), where a(1) = 10 and n is 2 or greater.

Step-by-step explanation:

First determine the common factor.  Note that mult. the first term (10) by 3/5 results in the given second term (6); the third term is 3/5 of the second term (6), resulting in 18/5 (equivalent to 36/10 or 3.6/1, or just 3.6.  And so on.

Thus, a(n) = (3/5)a(n-1).  We can demo that this "works" for the fourth term:

the third term is 3.6, which, if mult. by (3/5), produces 2.16, as expected.

Thus, the recursive formula for this geometric sequence is a(n) = (3/5)a(n-1).

This is good only for a(1) = 10 and n = {2, 3, }