You wish to mentally estimate the total cost of items that have the following prices: $1.85, $.98, $3.49, $9.78, and $6.18. rounding off the items to the nearest half-dollar, your estimate of the total cost of these items is a. $22.50. b. $23.00. c. $22.30. d. $22.59.

22.30

Step-by-step explanation:

Add all the numbers to get 22.38 then round

Hope this helps :)

depending on others is critical to survival. my source is apex!

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