Logarhythm

3a + 4b = 20

12a + 16b = 80

As you can see, if you multiply the first equation by 4, they are both the same. 

This means there are no solutions (D) for this system of equations :)

34 + 66 = 100. This means the other angles have to add up to (360 - 100) = 260 degrees. 

The answer is 139 and 121, and 150 and 110

2²⁸ = 268 435 456

Thank you!!

(x - 17) + (7x + 5) = 180

     x - 17 + 7x + 5 = 180

                 8x - 12 = 180

                        8x = 192

                          x = 24

$\sqrt{245} = 7\sqrt{5}$

$3\sqrt{125} = 15\sqrt{5}$

This means the denominator can be simplified to:

$(7 + 15 + 4)\sqrt{5} = 26\sqrt{5}$

Which means the entire fraction is:
$\frac{6}{26\sqrt{5}} = \frac{3}{13\sqrt{5}} = \frac{3\sqrt{5}}{65}$

(10 + 5 + 5)(8 + 5 + 5) = 20 * 18 = 360 ft² 

360 - (10 * 8) = 360 - 80 = 280ft², which is your answer :)

Squares => 1, 4, 9, 16, 25, 36...

There is only really one answer and it's 16 and 25. Their sum is 41 and their difference is 9. 

If "(5x10^2)+(2x10^3) is the denominator

 = 1/(500 + 2000)

 = 1/2500 or 0.0004

If this --> (1/(5x10^2)) + (2x10^3) is what you meant:
 = (1/500) + 2000

= $2000\frac{1}{500}$  or 2000.002

$\aleph_0?$