Answer:
<h2>
A.
and D. ![\bold {x=\dfrac{-3-\sqrt{21}}{2}}](https://tex.z-dn.net/?f=%5Cbold%20%7Bx%3D%5Cdfrac%7B-3-%5Csqrt%7B21%7D%7D%7B2%7D%7D)
</h2>
Step-by-step explanation:
![x^2 + 3x - 3 = 0\\a=1\,,\ \ b=3\,,\ \ c=-3\\\\x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\x=\dfrac{-3\pm\sqrt{3^2-4\cdot1\cdot(-3)}}{2\cdot1}=\dfrac{-3\pm\sqrt{9+12}}{2}=\dfrac{-3\pm\sqrt{21}}{2}](https://tex.z-dn.net/?f=x%5E2%20%2B%203x%20-%203%20%3D%200%5C%5Ca%3D1%5C%2C%2C%5C%20%5C%20b%3D3%5C%2C%2C%5C%20%5C%20c%3D-3%5C%5C%5C%5Cx%3D%5Cdfrac%7B-b%5Cpm%5Csqrt%7Bb%5E2-4ac%7D%7D%7B2a%7D%5C%5C%5C%5Cx%3D%5Cdfrac%7B-3%5Cpm%5Csqrt%7B3%5E2-4%5Ccdot1%5Ccdot%28-3%29%7D%7D%7B2%5Ccdot1%7D%3D%5Cdfrac%7B-3%5Cpm%5Csqrt%7B9%2B12%7D%7D%7B2%7D%3D%5Cdfrac%7B-3%5Cpm%5Csqrt%7B21%7D%7D%7B2%7D)
5% = 0.5
0.5n = 85
Divide by 0.5
0.5n = 85
/0.5 /0.5
n = 170.
The number is 170.
The interest is 3.5 percent or 3 percents of the sum she deposited.
Answer:
the answer is D 1+ /19;
Step-by-step explanation: