What is the length of the radius in circle C?

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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 jamie pay at the end?

Is the square root of 4 plus the square root of 16 rational?