An airplane travels 460 miles from san diego to san francisco in 2.5 hours, going against the wind. the return trip is with the wind, and takes only 2 hours. find the rate of the airplane with no wind. find the rate of the wind.

& ! < 3

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

ion

step-by-step explanation:

ion ion ion ion ion ion ion ion ion ion ion