A biker can ride a bicycle 18 miles in 3 hours. the messenger estimates that it will take 7 hours to bike 22 miles. here is the messengers work: step 1: 22-18=4

step 2: 3+4=7

what mistake did the messenger make?

• the messenger did not make a mistake. the estimate is correct

• the 3 and 4 should have been multiplied instead of added.

• the messenger used addition and Subtraction instead of multiplication and division

• the 22 and 18 should have been divided instead of subtracted

• the 22 and 18 should have been averaged instead of subtracted

, 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

47.28 or 47.2857143

step-by-step explanation:

you just divide 331 by 7 and you get that answer. ( i think so tho)