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Sorry....I typed it backwards after working it out on paper

    sqrt (2)  - 1

2x^2+2y^2+20x-16y-18=0           divide by 2

x^2 + 10x     + y^2 - 8y   = 9        complete the square for x and y

(x+5)^2      +  ( y -4)^2   = 9 + 25 +16

                                       = 50                   this is a circle centered at -5,4    and   r^2 = 50    <===== use this to calculate the area of the circle

*** edit ***    ( the last line is incorrect ...I added instead of multiplying)

A = C     and  B = D

a+  a + b + b = 36

a+b =18  

a+2 = b-2  

then    a = 7 b = 11      c = 11   and d= 7

7 * 11*7*11 = 170

7 * 11 *7 * 11 = 5929

AD/2 = 2/14

AD = 4/14

( s + y+ x + z) / 4 = 80         320 - (x+y+z) = s

(x+y+z + b)/4 = 96               384 - (x+y+z) = b

384 - 320 = range = 64

The expression simplifies to 81/x.

6 choices  X 14  X  3  X  7 = __________ possibles

Rob needs 8 allowance payments.

3^2    4^2   5^2    6^2   7^2   8^2         six

A = C     and  B = D

a+  a + b + b = 36

a+b =18  

a+2 = b-2  

then    a = 7 b = 11      c = 11   and d= 7

7 * 11*7*11 = 170

One value .

Yes, angle CAD can be equal to CBE, by placing points D and B close enough together.

incorrect...

k = 16.

There are 22 ways to spell FOOT.

There are 46 ways to form a triangle.

XZ = 7/2.

thank you so much!

x+y =25         y = 25 -x

x-y = 18    sub in for y

x -(25-x) = 18

2x = 43

x = 21.5

y = 3.5           21.5 *3.5 = _________

A + B + C + D = 36

A + 2 = B - 2 = C x 2 = D ÷ 2

A = B - 4
B = 2C + 2

C = D ÷ 4

D = 2A + 4

Let's find A first.

D = 2A + 4

C = (2A + 4) ÷ 4

    = 0.5A + 1
B = A + 4 

A + B + C + D = 36

A + A + 4 + 0.5A + 1 + 2A + 4 = 36

4.5A + 9 = 36

4.5 A = 27

A = 6

Since A = 6, 
B = A + 4 

   = (6) + 4

   = 10

C = 0.5A + 1

    = 0.5(6) + 1

    = 3 + 1

    = 4

D = 2A + 4 

    = 2(6) + 4

    = 12 + 4

    = 16

Which means the product of the four, ABCD = 6 * 10 * 4 * 16 = 3840, which is your answer 

would it be -59/84?

Wrong

1 - sqrt 2  

Find radius (using distance formula ) between the two points       then circumference = 2 * radius * pi