What is the value of 'k' in the following sum? 57 + 54 + 51 +..........+ k = -123
Graph the lines y = 3x and y = x in the first quadrant (both x and y greater than or equal to 0). If y = kx bisects the angle between the lines, as shown, what is the value of k equal to?
What is the value of the following sum? S = 12/21 + 22/22 + 32/23 + … + n2/2n + …
For some positive integer k both 4^k and 5^k start with the same digit x in base 10 i.e. 4^k = x..... 5^k = x..... What is the sum of all possible values of x.
