Question

Please help I don't understand

the table shows how the number of sit-ups marla does each day has changed over time. at this rate how many sit-ups will she do on day 12? Explain your steps in solving this problem

day 1 day 2 day 3 day 4 day 5
17 21 25 29 33

Answer 1

what you have is an arithmetic series.
There is a formula for this...
an = a1 + (n - 1) d
a1 = first term, so it would be 17
d = the common difference, so it would be 4
n = the number of the term you want to find, so it would be 12.
now we sub...
a12 = 17 + (12 - 1) 4
a12 = 17 + (11)(4)
a12 = 17 + 44
a12 = 61

your 12th term is 61

read more about this type of problem here...
http://www.regentsprep.org/Regents/math/algtrig/ATP2/ArithSeq.htm

Answer 2

thank you

Answer 3

no problem :)