Aswimming pool has the shape of a box with a base that measures 2727 m by 1212 m and a uniform depth of 2.72.7 m. how much work is required to pump the water out of the pool when it is full? use 1000 kg divided by m cubed1000 kg/m3 for the density of water and 9.8 m divided by s squared9.8 m/s2 for the acceleration due to gravity. draw a y-axis in the vertical direction (parallel to gravity) and choose one corner of the bottom of the pool as the origin. for 0 less than or equals y less than or equals 2.70≤y≤2.7, find the cross-sectional area a(y).

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.