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The question won't post above, so here it is:

quadrilateral ABCD is inscribed in a circle where AB>DC and AB is not parallel to DC. If X is the intersection of their diagonals, let the perpindicular from X to AB be called Y where XY intersects AB. If XY is the angle bisector of DYC, prove that AB is the diameter of the circle.

it says the answer is wring

I typed about that in the problem when I typed ps. But thanks for posting anyway. 

b) 212mph will be equal to 2 1 2......

In 1 second, this plane will travel 212/3600 miles or 0.058888 (0.06) miles

c) My estimate (For decimal) is probably an overestimate since I rounded a repeating decimal UP.

Hope all of this helped!

integer [109 / 3  ] =  36

integer [109 / 3^2]   =  12

integer [109 / 3^3]  =  4

integer [ 109/ 3^4 ]  =  1

Add these

36 + 12 + 4 + 1    =    53  = exponent on 3

Check this: https://web2.0calc.com/questions/number-theory-confuzzlement

Hope this helped!

YAY THANKS CPHILL

נגזרת של לן זה x^-1

Heureka   gives some good answers here :

https://web2.0calc.com/questions/help_73560#r2

600 grams at 20% off usual price of £5.00     

-- find 20% off the usual price of £5.00:  0.20 x £5.00  =  £1.00   --->   £5.00 - £1.00  =  £4.00 (final cost)

-- 600 grams for £4.00  =  600 grams / £4.00  =  150 grams for £1.00

600 grams + 30% for £5.00

-- find 30% of 600 grams:  0.30 x 600 grams  =  180 grams   --->   600 grams + 100 grams  =  700 grams (final amount)

-- 700 grams for £5.00  =  700 grams / £5.00  =  140 grams for £1.00

Which is the better price?

a)  Amount of interest  after  three  years  in both cases

Sue  interest                                                                           Bill   interest

2300(1+.024)^3  - 2300 =                                      1800 ( 1 + .034)^3  - 1800  =

169.61 pounds                                                               189.91  pounds

b)  Interst earned  by Bill in the  2nd situation

Interest  in first  two years  =   1800 ( 1 + .034)^2  - 1800  =  124.48 pounds

Interest earned in  the last year  =   ( 1800 + 124.48) (1 + .04)  -  ( 1800 + 124.48)  = 76.98 pounds

Total interest earned      =  124.48 +76.98   = 201.46  pounds

Bill  definitely gets  the  most interest  in this situation

a) Note that a combination is n!/(r)!*(n-4)!

We can write the equation in this form, and then simplify.

Hope this helped!

The problem is that the 4 americans each have a possibility of winning a different metal, so the total number of combinations that an american could win a metal.

4*3

or 4 americans that can win 3 different metals. Now the other two don't matter as much so we take the 11 other contestants for one of them, and then we have 10 left to chose from. So the answer is 

4 * 3 * 11 * 10 = 1320

Got it, thanks!

Dividing fractions is the same as multiplying the reciprocal.

4/5÷7/30

=4/5*30/7

=24/7

Hope this helped!

Yes. Click the "Latex" sign and write your equation. The machine, I guess, will give you your equation in latex.

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)Like this!

Hope this helped!

What you calculated is true, but that is the larger obtuse angle. He/She wants the smaller obtuse angle. So, 360 - 204 = 156 degrees.