a race car passes its first checkpoint at a constant speed of 20 m/s and immediately begins accelerating at a rate of 10 m/s2. how long
will the car take to reach the finish line 480 meters beyond the checkpoint?
this problem can be represented using the following equation.

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.