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Aleksandr-060686 [28]
3 years ago
5

an open concrete tank is internally 1m wide, 2m long and 1.5m deep, the concrete being 10cm thick. Calculate the capacity of the

tank in litres​
Mathematics
1 answer:
mixer [17]3 years ago
7 0
Capacity of tank in litres:

1x2x1.5=3m^3 or 3000 litres

Volume of concrete:

(0.1*1.5*1*2)+(0.1*1.5*2(0.1*2))*2)+(0.1*1.2*2.2)=0.3+0.66+0.264=1.224 m^3 of concrete

(Thickness x Depth x Width excluding the thickness of the wall x Two sides) + (Thickness x Depth x Length including the thickness of the wall on both sides x Two sides) + (Base slab dimensions)
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2x/x2-25=10/x2-25 - 4/x+5
White raven [17]
Hello,

x²-25≠0==>x≠5 and x≠-5

\dfrac{2x}{x^2-25}= \dfrac{10}{x^2-25}- \dfrac{4}{x+5}   \\

 \dfrac{2x}{x^2-25}= \dfrac{10}{x^2-25}- \dfrac{4(x-5)}{(x+5)(x-5)}   \\

2x=10-4x+20\\

6x=30\\

x= 5 

8 0
3 years ago
Researchers wondered whether the size of a​ person's brain was related to the​ individual's mental capacity. They selected a sam
storchak [24]

Answer:

Step-by-step explanation:

Given that researchers wondered whether the size of a​ person's brain was related to the​ individual's mental capacity

They selected a sample of 5 females and 5 males and measured their MRI counts and IQ scores.

The data is reported to the right. Complete parts ​(a) through ​(d) below.

We want scatter plot for IQ vs MRI in general.

So we group data into two columns X for MRI and Y for IQ and draw scatter plot

MRI IQ

 

816932 133

1001121 140

833868 132

856472 140

866662 130

1038436 139

1079550 141

924059 136

a) Scatter plot is attached as a file

b) correlation coefficient = Cov (x,y)/S_x S_y = 0.729889

B) Yes, MRI count and IQ are linearly related since the linear correlation coefficient is _____.0.729889 >0.5 and near to 1 than to 0

There is a positive moderate correlation between x and y (linear)

Download xlsx
7 0
4 years ago
Help I need answers now
Juli2301 [7.4K]

Answer:

<u>The Answer in Exact Form:</u>

-3/22

<u>In Decimal Form:</u>

-0.136

Step-by-step explanation:

-\frac{3}{2}÷5\frac{1}{2}=-3/22

8 0
3 years ago
If reporter jo reports 12 stories every 3weeks what is the simplified ratio of stories to weeks
bagirrra123 [75]
The simplified ratio would be 4 to 1! hope this helps :)
6 0
3 years ago
How many nanoseconds does it take for a computer to perform one calculation if it performs 6.7 × 10^{7} calculations per second?
crimeas [40]

Answer:

<u><em>the comuter does 1 calculation in 1.5*10^{-17} nanosec</em></u>

Step-by-step explanation:

<u><em>First step: we need to write all terms in nanosec, as we know:</em></u>

<u><em>1[nanosec]= 10^{-9}[sec]</em></u>

<u><em>The computer does 6.7*10^{7} [\frac{calculation}{sec}]</em></u>

<u><em>if we multiplicate for \frac{sec}{nanosec*10^{*9}}, from the units convertion.</em></u>

<u><em>6.7*10^{7} [\frac{calculation}{sec} * \frac{sec}{nanosec*10^{*9}}</em></u>

<u><em>6.7* 10^{16} [\frac{calculation}{nanosec}]</em></u>

<u><em>Now doing a simple three rule we have this:</em></u>

<u><em>6.7 * 10^{16} calculation in ⇒ 1 nanosec</em></u>

<u><em>1 calculation in ⇒ \frac{1 nanosec* 1calculation}{6.7*10^{16} calculation }</em></u>

<u><em>So, we found: the comuter does 1 calculation in 1.5*10^{-17} nanosec</em></u>

8 0
3 years ago
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