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You can set this calculater, but its default is degrees

Congruent, and angle angle similatiry therum. Are you in geometry?

PAB  and PCB both = 90

APCB is a quadrilateral... so....

The other two angles will sum to 180

So

ABC  +  APC  = 180

73  + APC  = 180

APC  = x  =  180  - 73   = 107

AO  = CO  = 4000

Angle BAO  is right

BA  =  13,200

BO is the hypotenuse of triangle ABO = sqrt ( 4000^2 + 13200^2)  = 13793

And  BC is the height above the Earth's surface  =  BO - CO =  13793  - 4000 =  9793  mi

Equal

AA Similarity

f(x)  =  4x- 1/4

In the form  mx - b......   m  = 4  = the slope....which is positive......then this function "Rises' [ increases ] from left to right....the end behavior on the left is toward negative infinity....and on the right it is positive infinity

f(x)  = (-1/2)x  + 3

The slope is negative  and this function "Falls" [ decreases] from left to right......the end behavior on the left is toward positive infinity....and on the right it is negative infinity

Here are the graphs of each  : https://www.desmos.com/calculator/g36i8bra7n

Sin   = opposite/ hypotenuse = O / H

Sin (30) = opposite / hypotenuse  =  1 / 2      

We need to find the adjacent side  = sqrt( H^2 - O^2 )  = sqrt ( 2^2  - 1^2 )   = sqrt (4 - 1) =

sqrt (3)

Cos(30) =   adjacent / hypotenuse =    sqrt (3)  / 2 

Tan (30) =     opposite / adjacent  =  1 / sqrt (3)     =  sqrt (3)  / 3

Brilliant. Thank you @CPhill - made my evening!

I think you want to factor this :

9c^2 - 42c  + 49   =

(3c - 7)  (3c - 7)  =

(3c - 7 ) ^2

its 21 or 19 depends on what you think if its asked on a test its 19 but DO NOT PUT 21 ON A TEST you will get that question wrong

Tan (45)  =  y / x  =     1 / 1

And 

Sin (45)   =  y / r     and   Cos (45) =  x / r    =   1 / r

And  r  = sqrt (1 + 1)    =  sqrt (2)

So

Sin (45)   = Cos (45)    =   1 / r =  1 / sqrt (2)   =   sqrt (2)  / 2

you are very rude

You change the place of the 3

We need to find the radius, r......so the area =

422.7  =   pi * (radius)^2     divide both sides by pi

[422.7 / pi]  = r^2          take the positive root of both sides

sqrt [ 422.7  / pi  ]   = r

And the circumference = 2 *pi * r  =

2 *pi * sqrt [2 422.7  / pi  ]    ≈ 72.88 ft.

x^3  +  48     ....there is nothing to distribute.....!!!!

OK

Forget about the "2"    we'll append that later

Since we have one repeated "8"....put this over the same number of "9's"  as repeated digits.....since we have one repeated digit....put the 8 over one 9    and we have    8/9

Add back the 2   and we have   2 8/9  =  26 / 9

Another approach

Let x = .8888....

And 10x  = 8.8888....so.....

 10x - x  =  8.8888 - .8888

9x  =  8      divide both sides by  9

x  = 8/9

Add back the 2 and we have   2 + 8/9  =  26/9

Good luck! What college?

Exactly.

Regular Pay  + Overtime Pay  =

[40 * 10.80] + [ 6 * (10.80 * 1.5) ]    =  $ 529.20

Hmm, I see. But what is the step to turn 0,888... into 8/9 and furthermore into 26/9? I just can't see it...

Many thanks.