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what is the value of x?

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triangle a b c. the measure of angle b is seventy five degrees, the measure of angle c is fifty degrees and the measure of angle a is x.

Which of the following expressions is equal to 2x^2+8

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x

I’m still confused on how to work the percentages