11a+9=4a+30 what is the answer

Mathematics

2 answers:

bezimeni [28]4 years ago

8 0

11a+9=4a+30
11a-4a=30-9
7a=21
a=21/7
a=3

PIT_PIT [208]4 years ago

7 0

A=3.......................

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3 years ago

Future value of 10% savings from earnings of1470 earning 3.5% annual interest compounded monthly for 25 years

Leviafan [203]

hmmm so let's see first how much is 10% of the earnings of 1470.

$\begin{array}{|c|ll} \cline{1-1} \textit{a\% of b}\\ \cline{1-1} \\ \left( \cfrac{a}{100} \right)\cdot b \\\\ \cline{1-1} \end{array}~\hspace{5em}\stackrel{\textit{10\% of 1470}}{\left( \cfrac{10}{100} \right)1470}\implies 147$

so then

$~~~~~~ \textit{Compound Interest Earned Amount} \\\\ A=P\left(1+\frac{r}{n}\right)^{nt} \quad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\dotfill &\$147\\ r=rate\to 3.5\%\to \frac{3.5}{100}\dotfill &0.035\\ n= \begin{array}{llll} \textit{times it compounds per year}\\ \textit{monthly, thus twelve} \end{array}\dotfill &12\\ t=years\dotfill &25 \end{cases}$