QUESTION 21 The northern lights are bright flashes of colored light between 50 and 200 miles above Earth. Aflash occurs 100 miles above Earth at point C. Find the measure of
BD the portion of the Earth from which the flash is visible. Round answer to the nearest degree,

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

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.

Me i'm timed right now! there's 4 answer