Answer:




Step-by-step explanation:
We have that:

When we substitute n=1, we get:

When we substitute n=2 we get:

When we substitute n=3, we get:

When we substitute n=n+1, we get:

Now

We expand and simplify to obtain:


To answer this question I tried to find a common multiple of 21 and 35 which I found to be 105. As they are in minutes 105 is 1 hour and 45 minutes; after this I found 1 hour 45 munutes after 7:30, I then got 9:15
9:15 is my answer
Hey.. I know you haven’t been able to find much help, but if you are still struggling this might help.
Try to set it up as an equation for example 25x +25=10x +15 and rewrite it in standard form and see if that helps
All real numbers greater than or equal to -3
5T < 10,000 lb
16T > 6,400 lb