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Substitute values of one equation into another. 

(1) x+y+2z = -2; (2) 3x-y+14z=6; x+2y=-5 (3).

Substitute x in (1) and (2) from (3).

When the polynomial 3x^3 +ax+ b is divided by x−2 , the remainder is 2, and when divided by x +1 , it is 5. Find the value of a and the value of b.

How is frequency density calculated?

y is proportional to x^2. When y is 75, x is 5. Find a formula for y in terms of x

Differentiate 4x^2 + 2ln3x + e^x