CPhill

I assume this is :

5 / [ 2a^4b^2] ; 1 / [8ab^3] 

LCD  = " Lowest Common Denominator"  =

8a^4b^3

100cm =  1m

1  =  (9.81) t^2

1/9.81   =  t^2

t ≈  .319  sec 

(X^2 + 2xy + y^2) =

(x + y) ( x + y)  =

(x + y)^2

9^(x+1) + 3^(2x+1)= 36

9^x * 9  + 3*3^(2x) = 36      divide by 3

3 * 9^x  + 3^(2x)  = 12

3 * 9^x + (3^2)^x  = 12

3 * 9^x + 9^x   =  12

9^x * (3 + 1)   = 12

9^x * 4   = 12      divide by 4

9^x  =   3

[3^2]^x  = 3^1

3^(2x)  = 3^1     equate exponents

2x  =  1    →  x  = 1/2

⁴√1800  ≈ 6.5135

Don't know why you'd care....but...if you must  : http://www.wolframalpha.com/input/?i=pi,+1st+40+digits

2120  * .13   =  275.6 acres remain

The height off the ground is given by  :

5  + √[61^2 - 11^2 ]   =  65 m

x^3+x^2-4x-4  = 0    factor

x^2(x + 1) - 4 (x + 1)  = 0

(x + 1) (x^2- 4)  = 0

(x + 1) (x + 2) ( x - 2)  = 0

Set each factor to 0 and x = -1, x = -2  or x = 2