ElectricPavlov

Yeppers....you got it !

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Absolutely !

Haha...assuming the body is 100% water (as you asked)...the number of cells is ZERO !

Just put in the value given to you for r

Original number of buyers = x

Price of boat = xy

after 10 drop out  price becomes  (x-10)(y+1)

after 15 more drop out  (x-25)(y+1+2)     all three of these amounts are equal (the price of the boat)

xy-10y+x-10  = xy +3x - 25y -75=xy

x-10y -10 = 3x-25y-75=0

System of equations becomes:  (solve for 'x' )

x-10y-10=0

3x-25y-75=0     multiply first equation  by -2.5

-2.5x+25y+25=0  add them together

.5x-50 =0

x=100 original buyers         100-10y-10=0    90 = 10y y = 9 price of boat per person  (TOTAL PRICE $900)

First.... find the equation of the line...

y = -x +1

the shaded area INCLUDES the line and everything GREATER than the line....

y>= -x+1

Add 7t   and subtract 2 from each side of the equatin to get :

8 2/3 t <6    divide both sides 26/3

t < 18/26

t< 9/13

Another approach:

Treat the angle as a right triangle

    Hyptotenuse = sqrt( 8^2 + 15^2 )= 17

(BUT remember this is in Quadrant III  Sin and Cos will be negative)

Tan = sin/ cos   = 8/15       sin = -8/17    cos = -15/17   cot = 1/tan = 15/8   sec = 1/cos = -17/15  csc = 1/sin = -17/8

Not sure what you are asking, but    433/250  is approximately sqrt(3)