Solve the following
a)n^2-n=0
b) 9q^2 -1 =0
c)(n-1)^2=16
kindly help me with this

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

If the value of cos330°is√3/2 then find cos 165°.