Martha works at a small jewelry store. She designs 2 rings in the first hour. Every additional hour, she designs 3 new rings. Select all the functions that can be used to find the number of rings, r(n), she designs in n hours.
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Answer:
n/2[4 + (n – 1)3]
Step-by-step explanation:
no. of rings designed in 1st hour =2
in 2nd hour. =2+3=5
in 3rd hour. = 5+3 =8.
we can see it seems like an A.P. where first term is 2. and common difference is 3.
so the no. of rings designed in n hours = n/2[2a + (n – 1)d]
on putting a and d. n/2[4 + (n – 1)3]
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