I don’t understand how to do part d

Agrocery store has 12 lb of trail mix that is 10% banana chips. the store's manager would like to add banana chips to bring the new mix up to 25% banana chips. write and solve a system of equations to find out how many pounds of banana chips manager needs to add.

Which of these triangle pairs can be mapped to each other using two reflections?

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount