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what is the percentage change original price=50 new price=20

1 - (20/50)=60% decrease from 50 to 20

Simplify the following:
2+7/12+1+3/7-1/8

Put 2+7/12+1+3/7-1/8 over the common denominator 168. 2+7/12+1+3/7-1/8  =  (168×2)/168+(14×7)/168+168/168+(24×3)/168-(21)/168:
(168×2)/168+(14×7)/168+168/168+(24×3)/168-(21)/168

168×2  =  336:
336/168+(14×7)/168+168/168+(24×3)/168-(21)/168

14×7  =  98:
336/168+98/168+168/168+(24×3)/168-(21)/168

24×3  =  72:
336/168+98/168+168/168+72/168-(21)/168

336/168+98/168+168/168+72/168-(21)/168  =  (336+98+168+72-21)/168:
(336+98+168+72-21)/168

| 2 | 2 |
| 3 | 3 | 6
| 1 | 6 | 8
|  | 9 | 8
+ |  | 7 | 2
| 6 | 7 | 4:
674-21/168

| 6 | 7 | 4
- |  | 2 | 1
| 6 | 5 | 3:
Answer: |   653/168=3 149/168 
 

i know guest i did this when i was beginning to draw in about 2011-2012

If you are using the web2.0 calculator you have to enter it like this:

(-1)^2     otherwise it will give you THIS answer:      -  (1^2)

Go online to this site and learn about it:

https://www.mathsisfun.com/algebra/matrix-multiplying.html

Could Someone please tell me why -1 to the second power is -1?

-1^2=+1

Where are you getting your answer from as being -1?.

Lebrun James makes 5.5x10^11 dollars per year for his salary. Kevin Durant makes 4.6x10^9 dollars per year for his salary. How many times more does Lebrun make than Kevin per year? 

Just divide Lebrun's salary by Kevin's:

(5.5 X 10^11) / (4.6 X 10^9)=119.6x Lebrun's is greater than Kevin's.

P.S. I don't think your salaries are ACCURATE!!!. Lebrun CANNOT make $550,000,000,000 per year!!!!!!!!!!. Maybe $55,000,000 or $5,500,000????. Ask your teacher.

V=4/3.Pi.r^3, where V=volume,r=radius

Solve for x:
2 x^2-5 x-6 = 0

Divide both sides by 2:
x^2-(5 x)/2-3 = 0

Add 3 to both sides:
x^2-(5 x)/2 = 3

Add 25/16 to both sides:
x^2-(5 x)/2+25/16 = 73/16

Write the left hand side as a square:
(x-5/4)^2 = 73/16

Take the square root of both sides:
x-5/4 = sqrt(73)/4 or x-5/4 = -sqrt(73)/4

Add 5/4 to both sides:
x = 5/4+sqrt(73)/4 or x-5/4 = -sqrt(73)/4

Add 5/4 to both sides:
Answer: |  x = 5/4+sqrt(73)/4                             or x = 5/4-sqrt(73)/4

Compute the price of a 3.8% coupon bond with 18 years left to maturity and an interest rate of 6.8% semi-annually

The price of Bond is=$69.122. Here are the two formulae that you can use to calculate this, if you wish to verify the price:                                                                                                                          PV=P{[1 + R]^N - 1.[1 + R]^-N. R^-1}=PV OF $1 PER PERIOD.(This will give you the PV of the stream of coupons)

PV=FV[1 + R]^-N=PV OF $1 IN THE FUTURE(This will give you the PV of $100 par value of the Bond at maturity)

Finally, you have to add the two PV together to get the price of your Bond.

Hallo Complex

llo

a = 2, b = -5, c = -6, do the arithmetic.

The number under the square root sign will be positive.

The trig identity you've written down is correct, but you can't substitute anything on the left hand side , sin(P+Q). That's the value that you are trying to calculate.

What you have to do is calculate the value of the two cosines on the right hand side.

To find the value of cosP, sketch a right angled triangle, call one of the angles P and fill in the lengths of the opposite side and the hypotenuse, (from the given value of sinP). Then use the pythagoras theorem to calculate the length of the third side and so read off the value of cosP.

Repeat the routine to find cosQ.

Then substitute for each of the terms on the right hand side.

There is a very nice calculator on this site, just in case your brain isn't quite capable of a sum of this magnitude

I'm not saying the ANSWER comes to a square root of a negative I'm talking about int the quadratic formula. If THAT is were you are saying I went wrong, plase just write the correct substitutions, then I can go from here

Hasn't this gotten old?

You're wrong in saying that it gives the square root of a negative number. Check your arithmetic.

Use the trig relationships, first

\(\tan^{2}A = 1 + \sec^{2}A\)

and then

\(\sec A= 1/ \cos A\)

That gets you a quadratic in \(\cos^{2}A\).

Check my arithmetic? You haven't helped whatsoever with that statement. Can you please explain

Check your arithmetic.

3.)     koh   +  h3po4  -->  k3po4  + h2o2         We need at least 3 k's to balance, so lets start by adding to the left

        3koh   + h3po4 -->  k3po4 +h2o2           Now the h's need to balance  you have 6 on the left...add some to the right

       3koh + h3po4          k3po4 + 3h2o2         Now the o's need to balance (we can only add o's with koh ...and we have to add them three at a time due to the k3po4 on the right equation.....this results in:

       6koh + 2h3po4  --> 2k3po4 +3h2o2       

Ok well here is an example...

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(Preview)

SnO₂ + H₂  ->  Sn + H₂O      

Here is the starting chemical equation. You need the same ammount of atoms on each side                                               of each atom. So you need the same ammount of "Sn" on each side. And "O". And "H". And so on and so forwth.

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(Answer)

SnO₂ + 2H₂  ->  Sn + 2H₂0

So here is the answer to balance out the equation.

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(Review)

Notice I put a 2 in front of H₂ and H₂O. Now there is...

(1)Sn (2)O  (4)H

Hope that helped a bit! (On how to do it of course)

-Complex

2.)    2 c2h6 + 7o2  =>  6 h20  + 4co2   

what you need to do ?

it is ok not the best though