THOR deposits $1000 into a savings account. The interest rate is 5.5% compounded weekly. What is the balance in ten years? - first determine what kind of formula you will use - what clue words are there to help you determine that?

Part A.

Since the value of – 8 ft refers to the depth of the water, then 0 must refer to the surface of the water in the pool. Or to look it the other way, 0 is the boundary of the water in the pool and the air in the surrounding.

Part B.

Since the height of the slide is + 7 feet, then this means that the top of the slide is 7 feet from the surface of the water in the pool.

Part C.

Since 2 feet of the pole was submerged in the water (2 feet is under the surface of the water), then Casey should mark the level of the bottom of the pole as -2.