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Algebra problem collection (11..20) |  |
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problems 1..10
problems 21 to 2711.
simplify:
12.
| given | x2 + y2 + xy = 9 x2 + z2 + xz = 16 y2 + z2 + yz = 25 | what is | xy + xz + yz = ? |
13.
Calculate edge X of this square:
14.
Solve x in equation: 4x + 6x = 9x
15.
| Given |  |
calculate a + b + c |
16.
if
then calculate 
17.
Given is a curve with equation:
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x3 + y3 - x2 - y2 + 3xy = 0
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calculate the derivative (tangent) in point (0,0).
18.
Calculate the area of triangle ABC:
19.
Solve x in the next equation:
20.
In the picture below the area of three triangles is given.
Calculate the area of the colored triangle.
