Alexis and martin the school set chairs in rows for an assembly. they put the same number of chairs in each row. using 92 chairs available, alexis made 4 rows with 2 chairs left over while martin made 5 rows with no chairs left over. write and solve an equation that can be used to find the number of chairs in each row.

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.