The top speed of a wildebeest is 64 km/h and the top speed of a zebra is 64.4 km/h. how much faster is a zebra in feet per second? 1 km = 0.62137 miles. round your answer to the nearest hundredths.

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.