SOLUTION: Veronica wants to purchase a radio that costs $250. She saves $10 the first month and increases that amount by $5 each month. How long will it take her to save $150?

Algebra ->  Test -> SOLUTION: Veronica wants to purchase a radio that costs $250. She saves $10 the first month and increases that amount by $5 each month. How long will it take her to save $150?      Log On


   

Question 397747: Veronica wants to purchase a radio that costs $250. She saves $10 the first month and increases that amount by $5 each month. How long will it take her to save $150?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

Question Sets Up a sequence {10,15,20,25,30,35,40...)of the savings amount

as months progress.

a%5Bn%5D=a%5B1%5D%2B%28n-1%29%2Ad

S%5Bn%5D=%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29

S%5B6%5D=%283%29%2820%2B+25%29 = $135  

S%5B7%5D=%283.5%29%2820%2B+30%29 = $175 

will take 7 months to at have at least $150