Homework Help: math

Posted by Melissa on Tuesday, January 3, 2012 at 6:12pm.

a student plants a seed, after the speed sprouts the student monitors the growth of the plant by measuring its height every week, the height after each of the first tree wees was 7mm , 20mm, and 33mm, respectively, if this pattern of growth continuesinwhat week will the plant be more than 100mm tall

math - Reiny, Tuesday, January 3, 2012 at 7:17pm
looks like d = 13

what term = 100?
7 + 13(n-1) = 100
13n - 13 = 93
13n = 106
n = 106/13 = 8.1

in 8 weeks the tree will be slightly short of the 100
( term(8) = a+7d = 7 + 91 = 98 )

So it will be more than 100 mm tall in the 9th week

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