exam Maths Puzzle Numerical Ability

How do I find which two triangles are similar? a) 48 degree and 69 degree b) 63 degree and 48 degree c) 63 degree and 78 degree

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Please help with problem. It comes from a homework sheet. Thank you.

Find the vertex of the parabola and determine whether the parabola opens upward, downward, to the left, or to the right.

15.) y = -(x+2)2 to the second power + 2
3⁄(5 √(24 ))+2⁄(5 √150)-√96

Add or subtract as indicated.