Help Find the volume of the cylinder

Write the fraction or mixed number and the decimal shown by the model

Evaluate cos2θ for cosθ = square root of 3/2

Will mark the brainliest. paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?