at the beginning of an environmental study a forest covers an area of 1500 km squared. since then this area has decreased by 7.9% each year let T be the number of years since the starter to study and let y be the area that the forest covers an kilometers squared write an exponential function showing the relationship between y and t

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

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.

If value of cos330° is √3/2 then find tan165°.