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Well, I don't know how to do that. Could you show me it step by step? Please!

ik the answer but i want to know the working 

increase $12 in the ratio of 5:4 is $15

Decrease 200 kg in the ratio 3:4 is 150kg

You can just use the take away sign too

Hint

Take the log of both sides. ;)

75.2cm to inches: 1 inch=2.54 cm, therefore we have:

75.2/2.54=29.61 inches.

Can you simplify 20 over 345?

20/345 divide both sides by 5,

4/69 and that is it.

Just the key "+ -" to right of zero. Enter a number and press that key, which will make it negative.

sarah has $12.45 in quarters and nickels. She has 39 more nickels than quarters. How many of each coin does she has?

Let the number of quarters be:q, then the number of nickels is:

q + 39, but we have:

.25q + (q + 39).05=12.45

.25q +.05q + 1.95=12.45

.30q=12.45 - 1.95

.30q=10.50 divide both sides by.10

q=10.5/.30

q=35 number of quarters, and

35 + 39=74 number of nickles, so that:

(35 X .25) + (74 X .05)=$12.45

3,07*10^16*300^(3/2)*e^(-1,196/(2*4,143*10^-21))

I hope you undestand how SMALL this number is!!

=10^(-10^19.79717056199065)

If you assume this is a RIGHT triangle, then the area= 1/2 x l x w = 1/2 x 14 x 9 = 63 sq ft

The "formula"  [ identity] for tan 2x =

2tanx / [ 1 - tan^2x]

why not just use the home page calculator, and by the way it is 7

It is  7.    :))

Slope = rise/run or  \(slope=\frac{y_2-y_1}{x_2-x_1}\)

Or, if you have a straight line equation of the form y = m*x + c, then m is the slope.

More generally, if you have an equation of the form y = f(x), then the slope at any point is df(x)/dx

.

Note:

.

Inverse sine is the same as arc sine.

[2nd] [asin] number

Hi 315,

This is what Wolfram Alpha says

Yes ipopsie, that is really good.

You just need to add the Tn=    out the front of each of them :))

(x+1)(x+3) =     x(x+3)  +1(x+3)

can you finish it?  At least have a try :)

inverse tan is the same as arc tan.

[2nd] [atan] number

So

16 + 9(n-1) =  7 + 9n

and

-4 + (-7)(n-1) =  3 - 7n

Is that Correct?

That is really good ipopsie,   :)

16, 25, 34 ,43, 52, ...        nth term = ......

Please tell me, what is being added each time?    d= 9                   and what is the first term?       a= 16 

If the same thing is being added on each time what kind of a sequence is it?

-4, -11, -18, -25, -32,        nth term = ......

Please tell me, what is being subtracted each time?   d= -7 each time     and what is the first term?   a= -4

And yes they are both APs.

The formula for the n'th term os an AP is      

 \(T_n=a+(n-1)d\)

where a is the first term and d is the common difference.

Now you should be able to tell me what the formulas are.

You will need to tidy up the algebra a little.

Remember there is an invisable multiply sign between the close bracket and the d       :)

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difference: 9    First Term: 61     Arithmetic Sequence

difference: 7    First Term: -39

Sun 14/11/15

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