How do i solve this problem? you drive your car on a cold day (20^of outside) the engine overheats to about (220^of). when you park the car the engine begins to cool down. the temperature t of the engine t minutes after you park satisfies the equation:
ln (t-20/200) = - 0.11t
(a) solve the equation for t
t=
(b) use part of (a) to find the temperature of the engine after 20 min ( t = 20). round the answer to 1 decimal place
t= f

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.