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Natalija [7]
3 years ago
13

Show the original equation, then solve for x

Mathematics
1 answer:
Lina20 [59]3 years ago
6 0

Answer: 24.7

cos 54° = x/42

⇔ x = 42. cos 54°

⇔ x ≈ 24.7

Step-by-step explanation:

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Diana invested $3000 in a savings account for 3 years. She earned $450 in interest over that time period. What interest rate did
Talja [164]

\bf ~~~~~~ \textit{Simple Interest Earned} \\\\ I = Prt\qquad \begin{cases} I=\textit{interest earned}\dotfill&\$450\\ P=\textit{original amount deposited}\dotfill & \$3000\\ r=rate\to r\%\to \frac{r}{100}\\ t=years\dotfill &3 \end{cases} \\\\\\ 450=3000\left( \frac{r}{100} \right)(3)\implies 450=\cfrac{3000\cdot 3}{100}r \\\\\\ 450=90r\implies \cfrac{450}{90}=r\implies 5=r\implies \stackrel{\textit{in decimal}}{0.05=r}

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3 years ago
jimmy raised $412.50 selling barbeque for a local chairity fundraiser. if he charged $7.50 for per pound of barbeque, how many p
Triss [41]

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Harrizon [31]

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Step-by-step explanation:

As you said, it could be anything, and there is proof that could be anything, which I'm sure your teacher would appreciate (writing proofs is a level of mathematical achievement that only hardcore math nerds can do, and it'd be super cool if you could write one yourself) A proof is basically a written mathematical description of exactly why something is the way it is.

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In the simplest assumed equation f(x) = 1 + x, x would have to = 0.

If we're looking at this graphically, y=1 (remember y=f(x)) graphed is a straight line that never crosses the x axis, which would mean there's no possible x value that would work for that equation.

Also, depending on what level math you're in, you may not even be working with undefined answers yet, in which case, your best answer would again be 0.

Hope this helped!

7 0
3 years ago
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