3 years ago

Is 1+3√15 rational number and why

Mathematics

2 answers:

Vitek1552 [10]3 years ago

5 0

Irrational because square root of 15 is irrational

denis23 [38]3 years ago

5 0

I think 12.6189
because 3<span>√15=11.6189
11.6189+1=12.6189</span>

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find the value of an investment of $3500 for 3 years at an interest rate of 5.6% if the money is compounded weekly

sergeinik [125]

$\bf ~~~~~~ \textit{Compound Interest Earned Amount}
\\\\
A=P\left(1+\frac{r}{n}\right)^{nt}
\quad 
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{original amount deposited}\to &\$3500\\
r=rate\to 5.6\%\to \frac{5.6}{100}\to &0.056\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{weekly, thus fifty two}
\end{array}\to &52\\
t=years\to &3
\end{cases}$

$\bf A=3500\left(1+\frac{0.056}{52}\right)^{52\cdot 3}\implies A=3500\left( \frac{6507}{6500} \right)^{156}
\\\\\\
A\approx 4139.9038869337$

3 0

3 years ago

Can someone help me?

tekilochka [14]

Check the picture below.

make sure your calculator is in Degree mode.