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A large open meadow near your city is shrinking in size because developers have started building new homes there.
The relationship between 
A, the area of the meadow, in hectares, and 
t, the elapsed time, in months, since the construction began is modeled by the following function.

A=1562.5*10^(-0.1 t)
How many months of construction will there be before the area of the meadow decreases to 500 hectares?
Give an exact answer expressed as a base-10 logarithm.
months

A large open meadow near your city is shrinking in size because developers have started building new homes there.\newlineThe relationship between A A , the area of the meadow, in hectares, and t t , the elapsed time, in months, since the construction began is modeled by the following function.\newlineA=1562.5100.1t A=1562.5 \cdot 10^{-0.1 t} \newlineHow many months of construction will there be before the area of the meadow decreases to 500500 hectares?\newlineGive an exact answer expressed as a base10-10 logarithm.\newlinemonths

Full solution

Q. A large open meadow near your city is shrinking in size because developers have started building new homes there.\newlineThe relationship between A A , the area of the meadow, in hectares, and t t , the elapsed time, in months, since the construction began is modeled by the following function.\newlineA=1562.5100.1t A=1562.5 \cdot 10^{-0.1 t} \newlineHow many months of construction will there be before the area of the meadow decreases to 500500 hectares?\newlineGive an exact answer expressed as a base10-10 logarithm.\newlinemonths
  1. Problem and Given Function: Understand the problem and write down the given function.\newlineWe are given the function A=1562.5×10(0.1t) A = 1562.5 \times 10^{(-0.1t)} , where A A is the area of the meadow in hectares and t t is the time in months since construction began. We need to find the value of t t when A A is 500 500 hectares.
  2. Equation Setup: Set up the equation with the given area.\newlineWe need to solve for tt when A=500A = 500 hectares.\newlineSo, we set up the equation: 500=1562.5×100.1t500 = 1562.5 \times 10^{-0.1t}.
  3. Isolate Exponential Term: Divide both sides of the equation by 1562.51562.5 to isolate the exponential term.\newline5001562.5=10(0.1t)\frac{500}{1562.5} = 10^{(-0.1t)}
  4. Calculate Left Side: Calculate the left side of the equation.\newline5001562.5=0.32\frac{500}{1562.5} = 0.32 (approximately)\newlineSo, 0.32=10(0.1t)0.32 = 10^{(-0.1t)}.
  5. Take Base10-10 Logarithm: Take the base10-10 logarithm of both sides to solve for t.\newlinelog(0.32)=log(10(0.1t))\log(0.32) = \log(10^{(-0.1t)})
  6. Property of Logarithms: Use the property of logarithms that log(bx)=xlog(b)\log(b^x) = x \cdot \log(b).log(0.32)=0.1tlog(10)\log(0.32) = -0.1t \cdot \log(10)Since log(10)\log(10) is 11, we have:log(0.32)=0.1t\log(0.32) = -0.1t
  7. Solve for t: Divide both sides by 0.1-0.1 to solve for tt.\newlinet=log(0.32)0.1t = \frac{\log(0.32)}{-0.1}

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