The water level in an inflatable pool decreases by about 6.35×10−1 centimeters each day due to evaporation. there are 8.64×104 seconds in a day. about how many centimeters does the water level in the pool decrease each second?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

Tom drove 206 miles in 3.9 hours. estimate his average speed.