What is the surface area of the ramp

What two criteria are needed for triangles to be similar

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each,and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent.how much did jame pay at the end?