jared is standing 20 feet from a rock-climbing wall. when he looks up to see his friend ascend the wall, the angle of elevation is 48 degrees. how high up the wall is his friend? round to the nesredt foot .

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Which is the focus of a parabola with equation y2=4x