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The first thing to know is that a square has equal sides, and that the area of a square is length x length.

Therefore in this case

Length x length = 100    or    Length^...

6x + y = 8 (1)       4x - y = 12 (2)

Method 1 elimination:

-Adding/subtracting the two equations together to eliminate one of ...

the lenght of ladder is contant. when it is in the middle of sliding, it make a right angle triangle with the floor and wall, hence (the lenght of the ladder£^2  equal to (the lenght of floor to one en...

The expectation of x, E(X), is the sum of the product of the value of the i^th outcome (x_i) and the probability of the i^th outcome (p_i). So:

E(X...

To tackle sequence questions like this you first have to find the difference between each term of the sequence and this number will go in front of the 'n'. Then to find the full expression, you have to...