In a gaming tournament, the high score to beat is 15,800. Your score is 13,103. How many more points do you need to tie the high score? Which equation represents this problem?

15,800 + p = 13,103

p = 13,103 + 15,800

13,103 + p = 15,800

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.