John walked 10 miles on saturday. he walked twice as fast on the second 5 miles of his walk than he walked on
the first 5 miles of his walk. which expression represents the time he spent walking? let x = john's speed on the first
half of his walk.

15/x

5/3x

15/2x

10/3x

pretty sure 750 each month!

step-by-step explanation:

, 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