Give an example of a system of linear equations that has no solutions. Explain how can you decide the number of solutions without solving the system.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Which two fractions are equivalent to 6/11? 6/22 and 18/33 12/22 and 18/33 12/22 and 18/22 3/5 and 6/10

Thomas is using a drawing program to complete a construction. which construction could he be completing? two perpendicular lines are drawn. inscribing an equilateral triangle in a circle inscribing a square in a circle inscribing a regular pentagon in a circle inscribing a regular hexagon in a circle