The blog for Mr. Arocena's classes. Recorded here are assignments, quizzes, tests, projects and the current scores for all teams competing for the Arocena Cup. Occasionally I'll post something else too (most likely pertaining to education)
"It's not that I'm so smart, it's just that I stay with problems longer." - Albert Einstein
For 5b (and c and d also) you need to divide the interest rate based on when it is compounded.
So for b, semi-annually means you compound it twice a year (so interest is divided by 2) and the exponent variable now represents every 6 months as opposed to every year.
For c, monthly means every month (so 12 times a year and therefore interest is divided by 12) and the exponent variable represents 1 month and so on.
how do we do 5 b-d?
ReplyDeleteFor 5b (and c and d also) you need to divide the interest rate based on when it is compounded.
ReplyDeleteSo for b, semi-annually means you compound it twice a year (so interest is divided by 2) and the exponent variable now represents every 6 months as opposed to every year.
For c, monthly means every month (so 12 times a year and therefore interest is divided by 12) and the exponent variable represents 1 month and so on.
Hope that helps.
im having problems with number 1, im using the formula from the notes but i keep getting different answers. this is how i wrote it.
ReplyDelete300=200(1+0.07)x
300=200(1.07)x
log300-log200 divided by log(1.07), the answer is 7 but im getting much lower numbers, whats wrong with this formula?
Are your brackets in the right place when putting it into your calculator?
ReplyDeleteIn your calculator you should be entering (log(300)-log(200))/log(1.07)
If it is inputted as log(300)-log(200)/log(1.07) the calculator will do the log(200)/log(1.07) first then subtract that amount from log(300).
Your steps are correct by the way.
ReplyDelete