book Maths Puzzle Numerical Ability

If each base angle of an isoceles triangle measures 55degrees,find the measure of the vertex angle of the triangle

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book Other Question

A 42-meter is to be cut into three pieces so that the second piece is twice as long as the first piece. If the third piece is 2 meters more than five times the first piece, find the length of each of the three piece. Hello
I need to solve the following problem:
A company uses the function: C(x) = 2x2 – 40x + 250 to model the cost of producing x units. How many units must be made to minimize the cost?
Thanks much
Mhunter