Can some one please help me find the solution of the question

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

How can you construct perpendicular lines and prove theorems about perpendicular lines

The triangle shown has a hypotenuse with a length of 13 feet. the measure of angle a is 20 degrees. and the measure of angle b is 70 degrees. which of the following is closest to the length, in feet, of line segment ac? no need to use a calculator to find the trig numbers. each function is listed below. 4.4 5 12.2 35.7