Please help me it’s due in a couple of mine

Evaluate cos2θ for cosθ = square root of 3/2

Which of the following circles have their centers on the x-axis? check all that apply.

Jo divides a candy bar into eight equal pieces for her children to share she gives three pieces to sam three pieces to leslie and two pieces to margie rose the two month old baby does it doesn't get any what fraction shows how muchw candy each of the four children got. what's the answer to my question