Brainiest to whoever right it’s easy

Which of the following is the shape of a cross section of the figure shown below

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

Ashop has a sale that offers 20% off all prices. on the final day they reduce all the sale prices by 25% linz buys a ratio on the day. work out the overall percentage reduction on the price of the ratio