What is the geometric mean of 7 and 9.

Mathematics

1 answer:

kirza4 [7]3 years ago

4 0

<span>√63 = 3√7 is your answer</span>

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Answer:

E: (2, -1)

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Step-by-step explanation:

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Caroline puts $400 into a savings account that earns 6% annually. Write a function that represents this situation, where t is th

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Answer: 19 years

Step-by-step explanation:

Given

Amount invested $\$400$

Rate of interest $R=6\%$

after 1-year amount becomes

$A=400\left (1+6\%\right)\\A=400\left (1+0.06\right)\\A=400\times 1.06\\A=\$424$

After n years it is

$A=400\left (1.06\right)^n$

Sum accumulated is $\$1200$

$\Rightarrow 1200=400\left(1.06\right)^n\\\Rightarrow 3=\left(1.06\right)^n\\\text{Taking log both sides}\\\Rightarrow n=\dfrac{\ln 3}{\ln 1.06}\\\\\Rightarrow n=18.85\approx 19\ \text{years}$