Aboat travels 35 miles in 1 hours (with a constant speed), how much time will it take traveling 357 miles?

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.

Solve for x and select the correct answer

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?