Generally , you cannot do this on a calculator, but there are websites where you can enter your equation and get the derivative....
Here is one:
http://www.derivative-calculator.net/
Log k = 62.7
10^(log k) = 10^62.7
k = 10^62.7 = 5.01187 x 10^62
1 / ((sqrt 2 -isqrt2) / 2) = 2 / (sqrt2-isqrt2)
There are ENTIRE courses in high school and college dedicated to this......what is the function?
From second equation : x = 6 - 2y substitute this value of x into the first equation
3(6-2y) - 2y +6 = 0
18-6y-2y+6 = 0
24-8y=0
y=3 SUstitute this value of y into one of the equations to find x x +2(3) -6 = 0 then x= 0
The summation of all positive integers less than 400 is 79800 now just subtract the summation of all integers <400 that are divisible by 5 (previous answer).
There are infinite answers to this. Just pick ANY 'x' value and compute the 'y' value that makes it true. For a DISCRETE answer (x,y) you will need a second equation relating x and y....
30,000 (?)
This does NOT include 400 in the sum
