ElectricPavlov

16 + 9 - 2  =

200 000  +      3  *  .08  * 200 000

You STILL don't have all of the question posted.....

    to solve        y = 10 - x    

       then   x^2 - y^2 = 56

                  x^2 - (10-x)^2 = 56   <===== solve for 'x'   then 'y' = 10 - x

They sum to 360

q   +    5q+15    +   3q+25     +   3q + 70   =  360     now solve for 'q'    then use 'q' to calculate the angles to see which is largest....

3x^2+72x+4     re-arrange to:

3 (x^2 + 24x)   +   4    complete the square

3 (x+12)^2   - 428       <===== take it away !

b)   Take 1/5 th of the pentagon as shown below

     we need to find 'b'   (which is 1/10 th of the perimeter)

         calculate the area of 10 of these triangles = 6 

              10 *  1/2 b h

              10 * 1/2 ( hyp sin36 * hyp sin54)  = 6

                             hyp^2 sin36 sin 54 = 1.2

                             hyp = 1.588556        then   'b' = hyp * sin 36 = .9337296      perimeter = 10 * b =  9.337296

Now do the same for the larger pentagon   to   get tthe ratio of the perimeters   (basically do the above calculations wth '6' changed to 73.5)    

(7.8, 2.2)

27 km / ( 1 hr 48 min ) = 27 km / 1.8hr = 15 km / hr         Amanda   18 km/hr

Rounded to nearest unit    9

rounded to nearest tenth  9.5

rounded to nearest 100th  9.45