Twelve out of 18 students in mrs. marlin's class buys pizza for lunch on fridays. at this rate, if there are 240 students in the entire school, how many students can be expected to buy pizza for lunch this friday.
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What is this equation in point-slope form?

Precalculus question, image attached.

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.