Marty is proving that the following trigonometric identity is true: tan^2 of theta times cos^2=1-cos^2of theta. What would be the first line to his proof?

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?

Can someone explain to me how to do

What is the solution for the following system of equations? use any method to solve. 2x + 8y = 4 x = -3y + 5 question 4 options: x = 14, y= -3 x = 2, y = -3 x = -3, y = -3 x = 12, y = 5