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GREYUIT [131]
3 years ago
10

How many years will it take for $2000 to double at a simple interest rate of 8%?

Mathematics
1 answer:
nikitadnepr [17]3 years ago
7 0

Answer:

12.5 years

Step-by-step explanation:

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Help me with question a please ! With full workings !
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b)

since QR=QP, that means that QO is an angle bisector, and thus the segments it makes at the bottom of RO and OP, are also equal, thus RO=OP

thus, since the point P is 0.5 units away from the 0, point R is also 0.5 units away from 0 as well, however, is on the negative side, thus R (-0.5, 0)


c)

what's the equation of a line that passes through the points (-0.5, 0) and (0,2)?

\bf \begin{array}{lllll}&#10;&x_1&y_1&x_2&y_2\\&#10;%   (a,b)&#10;Q&({{ 0}}\quad ,&{{ 2}})\quad &#10;%   (c,d)&#10;R&({{ -0.5}}\quad ,&{{ 0}})&#10;\end{array}&#10;\\\\\\&#10;% slope  = m&#10;slope = {{ m}}= \cfrac{rise}{run} \implies &#10;\cfrac{{{ y_2}}-{{ y_1}}}{{{ x_2}}-{{ x_1}}}\implies \cfrac{0-2}{-0.5-0}\implies \cfrac{-2}{-0.5}

\bf m=\cfrac{\frac{-2}{1}}{-\frac{1}{2}}\implies \cfrac{-2}{1}\cdot \cfrac{2}{-1}\implies 4&#10;\\\\\\&#10;% point-slope intercept&#10;y-{{ y_1}}={{ m}}(x-{{ x_1}})\implies y-2=4(x-0)\implies y=4x+2\\&#10;\left. \qquad   \right. \uparrow\\&#10;\textit{point-slope form}
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3 years ago
A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was 1548 and the standard deviati
Viefleur [7K]

Step-by-step explanation:

z-score is:

z = (x − μ) / σ

For the four students:

z = (1990 − 1548) / 319 = 1.39

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Step-by-step explanation:

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125 rounded to the nearest tenth
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130 is rounded to the nearest TENS

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