ElectricPavlov

Volume of tank =   (1.75 x 12 )in    x   (1.25 x 12) in   x   11 in =   3465  in³

3465 in^3   /  ( 231 in³ /gal)    x   $ 3 /gal  =  $ 45 to fill ENTIRE tank....but you only need 80% of this as tank is 20% full

      80% x $45 = .8 * 45 =  $ 36   to fill the already 20% full tank

3/4     the numerator is perimeter and is measured in feet    to convert to inches , multiply by 12       3 x 12 = 36 in

          the denominator is area and is expressed in feet².... to convert to inches² , multiply by 12 x 12 = 144   4 x144 = 576 in²

36/576 = 1/16   

y = -16t^2 +80 t         describes the height.....soooooo

height = 36 ft

36 = -16 t^2 +80t    

-16t^2+80t -36 =0       Now use the Quadratic Formula to determine the values of t.....there will be TWO....one (the smaller) will be on the way up and the other will be t for the way down.....obviously you want the smaller one....

  \(t = {-b \pm \sqrt{b^2-4ac} \over 2a}\)    a = -16    b = 80    c = -36         You should be able to do this now....or you are in the wrong class for your abilities so far

Multiply 1.75 ft and 1.25 ft then covert the sum to inches by multiplying it by 12.

.... you'll need to multiply by 12 x 12 = 144 sq in  / sq foot       not just multiply by 12 alone....      just a heads up FYI

54 min * 4 people / 6 walls =   36  min-people/ wall

36 min-people/wall   x   7 wall/6 people = 42 min

arcsin (-2/3)= -41.81 degrees   (this is the same as 318.19 degrees)

            also       = 221.81 degrees

via calculator.

The dog has been running at 10 mph  for 1 hour

10 m/ hr  x  1 hr = 10 miles

A    x  AND  y are  positive

B    x is negative    y is positive

C    x AND y are negative

D    x is positive   y is negative

Well the method was detailed.....you should be able to do it yourself now....  

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)      this is the quadratic formula....you should know it   

b^2 - 4ac      is the discriminant      if  it = 0   there is one (double) root

                                                        if it = perfect square there is two roots

                                                        if it <0  there are 2 imaginary roots   

                                                        if it > 0  there are two real roots 

6.370 x 10³  km        6.370 x 10⁶  m