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13-x-3>4x
10>4x+x
10>5x
2>x
x<2

1. Label your equations 1 and 2.
2. Look to eliminate one of your variables to create a third equation with only one variable.
3. To do this multiply the first equation by 2 to obtain: 6x +...

The tangent is the straight line passing through x=1, touching the curve only at that point. For x=1, y=(4+1)^3=125 Using the chain rule we obtain dy/dx = 38x(4x^2+1)^2. To then get the gradient ...

The equations for an arithmetic sequences are 1) Un = u1 + (n - 1)d 2) Sn = n/2(2*u1 + (n-1)d) 3) Sn = n/2(u1 + un)

The first step is to calculate the common difference, d. This is done using the f...