exam Maths Puzzle Numerical Ability

I need to find the altitude of the triangle

13 by 10 by 13

I have no idea how to do this.

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exam Other Question

Celsius temperature readings can be converted to Fahrenheit readings using the formula f=9/5c+32. What is the Fahrenheit temperature that corresponds to each of the following Celsius temperatures: -10,0,15,100 I also need help with theese three if you dont mind me asking for it.

4(3 − 2) = 4(3) − 4(2)

9 + 8 = 8 + 9

4 + (2 + 6) = (4 + 2) + 6