Alan

You should check the above by raising each of them to the power 4.

Don't panic DS!  The site seems to be undergoing a number of improvements/changes at the moment and peoples points have been going up and down like yoyos! 

Just grit your teeth and wait for everything to settle down!

Just copy and paste these into the calculator on the home page here.

107 is a prime number so there isn't a simpler way of representing this, though you can get an approximate decimal representation as:

$${\mathtt{45}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{107}}}} = {\mathtt{465.483\: \!619\: \!475\: \!487\: \!021\: \!1}}$$

Area of a circle is given by $${\frac{{\mathtt{\pi}}{\mathtt{\,\times\,}}{{\mathtt{diameter}}}^{{\mathtt{2}}}}{{\mathtt{4}}}}$$

You can plug your numbers into this formula using the calculator on the home page of this site.

Applications of linear equations in real life:

•          Pharmaceutical research:  Measurements of the effect of a new drug might show a roughly linear relationship between drug dose and survival time.  You would want to best-fit a straight line to the measurements for use in clinical application.
•          Automotive design: Car suspensions can be approximately modelled by a linear equation relating force to displacement.
•          Electronic circuit design: Electrical and electronic engineers make great use of Ohms law – a linear equation relating electric current and voltage.
•          … every Engineering discipline you can think of uses linear equations (among others).
•          Optimisation of warehouse storage and transport of goods from warehouse to stores by large supermarket chains uses linear equations.
•          Fundamental Physics research uses …
•          … etc. etc. etc.

You are right rosala - I misread your sentence and didn't notice it referred to the number of answers!  But I gave you a thumbs-up anyway!

"...you cant see the answers displayed but just it comes on the right side the number of answers and also u can find that out with the help of those tiny black dots!..."

And the number of those dots tells you the number of answers.

Actually, it seems like you can click almost anywhere in the question region and the first lines of the answers are displayed.

This could be a table with two columns and ten rows.  The first column would simply contain the numbers 1 to 10, and the second column would contain the measured times for each drop.  (Can't do much better than that without the actual data!)

(Incidentally, having four zeros after the 1 seems to be overkill!  Would you really want to specify the height of a coin off the floor to a ten thousandth of a metre?)

The temperature of a mix of ice and water in equilibrium at 1 atmosphere pressure is defined as 0°C.  This is the same as 273K (strictly it's 273.15, but what's 0.15K among friends!). (I'm assuming it's pure water.  If it's salty water, that's used to define 0°F.)

And you are correct about centripetal acceleration.