Can someone please help? Algebra 2

Question

I keep getting the wrong answer for these questions. If someone could please help that would be great.

 

1. Zeus Industries bought a computer for $2538. It is expected to depreciate at a rate of 20% per year. What will the value of the computer be in 4 years?


Round to the nearest penny. Do not type the "$" sign in your answer

2. The annual Gross Domestic Product (GDP) of a country is the value of all of the goods and services produced in the country during a year. During the period 1985-1999, the Gross Domestic Product of the United States grew about 3.2% per year, measured in 1996 dollars. In 1985, the GDP was $577 billion. I what year did/or will the GDP equal $2.2 trillion?

 

3. A radio active isotope decays according to the exponential decay equation where t is in days.

Round to the thousandths place.

For the half life: The half life is the solution (t) of the equation : a2=ae^−7.571t

 

 

THANK YOU!!!

Answer 1

We are going to assum, in the absence of other information, the depreciation is linear.Given the annual depreciation rate is 20% or 0.20 per year. Then the annual depreciation becomes

0.2 *2538 = 507.60 or for four years: 2030.40

Therefore, the residual value, after four years may be calculated as follows:

2538 -2030.40 = 507.60 (nearest cent)