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Ganezh [65]
3 years ago
6

Simplify the following expression:

Mathematics
1 answer:
aliya0001 [1]3 years ago
7 0

Answer:

-2x-8

Step-by-step explanation:

-1/3(6x+15)-3

-6/3x-15/3-3

-2x-5-3

-2x-8

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A person gets on and off a bathroom scale four times. The four readings (in pounds) are 148, 151, 150, and 152. Each time after
Ganezh [65]

Answer:

See explanation below

Step-by-step explanation:

Since each time after the person gets off the scale, the reading is 2 lb the person's weight must be near the mean of

148-2, 151-2, 150-2, 152-2; that is to say, near the mean of 146, 149, 148, 150 = (146+149+148+150)/4 = 148.25

We could estimate the uncertainty as <em>the standard error SE </em>

\bf SE=\frac{s}{\sqrt{n}}  

where  

<em>s = standard deviation of the sample </em>

<em>n = 4 sample size. </em>

Computing s:

\bf s=\sqrt{\frac{(146-148.25)^2+(149-148.25)^2+(148-148.25)^2+(150-148.25)^2}{4}}=1.479

So, the uncertainty is 1.479/2 = 0.736

<em>It is not possible to estimate the bias, since it is the difference between the true weight and the mean, but we do not know the true weight. </em>

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2 years ago
Nan rode the roller coaster 8 times, which was twice as many times as she rode the F erris wheel
lyudmila [28]

So she rode the Ferris Wheel 4 times. 8/2= 4

8 0
3 years ago
The entire rectangle below has an area of .
Nastasia [14]

Answer:

Hence the required ans. Is 24cm2.

Step-by-step explanation:

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5 0
3 years ago
(2x + 35)=(5x-22) what’s x
finlep [7]

Answer:

x=19

Step-by-step explanation:

5 0
3 years ago
The correlation coefficient r between a child’s age, x, and the number of minutes spent doing homework each day, y, is 0.694. Wh
jonny [76]
<span>So, they are looking for the percentage that is NOT explained... Well, given the r we can find the percentage that IS explained by it first. That's given by r^2.

</span>Now - let's take the square of r it gives me .481636. That means that about 48% IS explained. Therefore, the part that cannot be explained must be the missing part (out of 100% <span>so 100% - 48.1636% should be it :)
</span>
<span>So 100% - 48.1636% = 0.518364 and we want to round that off to three decimal places which will give us 0.518... and then we could convert that to a percent for the final. So 0.518 as a percentage is 51.8%! s</span>
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3 years ago
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