Mr. Deniro went out for lunch during his break from work. He ordered a sandwich for $9.99 and juice for $3.50. He decided to leave a 15% tip. Also, where he lives there is an 8.25% tax rate. How much did Mr. Deniro pay in total?

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin