The central texas drought causes water level of area lakes to exponentially decay by a rate of 20% per year. if lake travis had 300 billion gallons of water in 2010, how many billions of gallons are left in three years

153.6 Gallons

Step-by-step explanation:

The formula for exponential decay is A=P(1-r)^t. In this equation, that would be written like A=300(0.80)^3. 0.80 to the third power would be 0.512 You would then multiply that by the three hundred. Which would get you 153.6.

'A' would be the answer.

'P' is the amount you start with.

'R' is the percent in decimal form.

'T' is equal to the amount of time in years that passes.

the solution is h=10 because you add 9 to each side of the equation.

the expression (1.26)2t reveals the approximate rate of increases in the number of plants semiannually.

hope this : )