Hiking burns about 144 calories each half hour. about how many calories can be burned if someone hikes 3 days a week for an hour?

∆red ≅ ∆ by rule will give brainiest if possible

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.

Percent increase and decrease. original number: 45 new number: 18