Solve the equation in the specific interval
a) cos x = -0.7 , 2π ≤ x < 4π

Given (1+cosx)/(sinx) + (sinx)/(1+cosx) =4, find a numerical value of one trigonometric function of x. a. tanx=2 b. sinx=2 c. tanx=1/2 d. sinx=1/2

What is the expression in factored form? 225x^2 - 144 a. 9(5x+4)^2 b. 9(5x-4)^2 c. 9(4x+5)(4x-5) d. 9(5x+4)(5x-4)

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?