Jack and jill are 20m apart. jack sees the top of the building at 30 degrees and jill sees the top of the building at 40 degrees. what is the height of the building

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Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b