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ProfessorGAC

(77,662 posts)

7. No Rule of 72

Reply to PoindexterOglethorpe (Reply #6)

Sat Oct 9, 2021, 06:35 PM

Oct 2021

I insist on knowing the answer (to 2 decimals, at least), not an estimate, and the rule of 72 is of no help with tripling or quintupling the principal. It only works for doubling.
For me, it's all in setting up the problem mentally so I can iteratively zoom in on the answer.
My wife thinks I'm nuts.

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Two Substituting Firsts, This Week [View all] ProfessorGAC Oct 2021 OP

What's the answer to the harder problem. I was never good... brush Oct 2021 #1

Subtract 6x and add 31 to each side royable Oct 2021 #2

Is the x and unknown or multiplication simbol? brush Oct 2021 #8

In this case, the x is the unknown. It could by y or z or a or gamma or a box. royable Oct 2021 #9

Ten & Two-thirds ProfessorGAC Oct 2021 #3

I was likewise able to solve that second one. PoindexterOglethorpe Oct 2021 #4

Good For You! ProfessorGAC Oct 2021 #5

I never did learn to do cube roots. PoindexterOglethorpe Oct 2021 #6

No Rule of 72 ProfessorGAC Oct 2021 #7

Ahh, you want the exact answer. I get that. PoindexterOglethorpe Oct 2021 #10