Help!! Thank you! :)

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

Which of the following is the maximum value of the equation y=-x^2+2x+5 a. 5 b. 6 c. 2. d. 1