Jackson buys a watermelon for $8.55 and 4 pounds of chemes. Tim buys a pineapple for $2 15 and 3 pounds of chemies. Use the variable p to represent the price in dollars, per pound of cherries. Write and simplify an expression to represent how much more Jackson spent.
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The expression represents how much more Jackson spent than Tim
(Simplify your answer. Use integers or decimals for any numbers in the expression)

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.