Drilon got 63 out of 72 correct in his test. What fraction of the marks did he get wrong?
Give your answer in its simplest form.

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c, with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?

Bring the fraction a/a-4 to a denominator of 16-a^2