exam Maths Puzzle Numerical Ability

Find the length x in each triangle. Express your answer in simplified radical form.

Side 1: 10 Side 2: 8 Bottom: x

I need some help with this problem. Thanks

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Can anyone help with this?

A line passes through the point (-4,-9) and has a slope of -3 . Write an equation for this line in x,y -coordinates. i have to solve M5=12 i dont understand?