What are the advantages/disadvantages of having a quadratic in standard form? Vertex Form?

Afurniture store has 1,500 chairs in storage. a manager uses three delivery receipts to simulate samples to check 100 chairs and note the number of brown chairs. suppose the actual number of brown chairs is 1,080. about how many brown chairs are

Which representation has a constant of variation of -2.5

Evaluate cos2θ for cosθ = square root of 3/2