1,2,3.

Mathematics
Tutor: None Selected Time limit: 1 Day

Apr 12th, 2015

1. AB = AD;   5x - 4 = 3x + 6;  5x - 3x = 6 - (-4); 2x = 10; x = 5.

2. Pythagorean theorem for triangle ACD: 12^2 + r^2 = (6 + r)^2; 144 + r^2 = 36 + 12r + r^2; 108 = 12r; r = 9. 

3. As in # 1, 2x^2 + 8x - 17 = 8x + 15; 2x^2 = 15 + 17 = 32; x^2 = 16; x = 4.

Apr 12th, 2015

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Apr 12th, 2015
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Apr 12th, 2015
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