The time it takes to double the balance in an account varies inversely with interest rate. if you invest $1,000 at 6% it will take 12 years to double your money. find the time it will take to double your money at 4 %

  18 years

Step-by-step explanation:

At 2/3 the interest rate, the doubling time goes up by a factor of 1/(2/3) = 3/2.

  (3/2)(12 years) = 18 years

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

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