Percentages word problems

4 questions in files. percentages and rounding using exponential functions and equations, using the power of x.

Bismouth-210
Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the
remaining Bismuth-210 transforms into another atom (polonium-210 in this case) each day. If
you begin with 178 mg of Bismuth-210, how much remains after 8 days?
After 8 days, mg of Bismouth-210 remains.
Round your answer to the nearest hundredth as needed.
Writing Linear and Exponential Equations
When a new charter school opened in 1990, there were 800 students enrolled. Using function notation, write a
formula representing the number, N, of students attending this charter school t years after 1990, assuming that
the student population:
Increases by 68 students every 4 years
N(t)
=
Preview
Decreases by 56 students every 2 years
N(t) =
Preview
Increases by 6% every 4 years
N(t) =
Preview
Decreases by 14% every 3 years
N(t)
Preview
Increases by 20 students every semester (twice each year).
N(t) =
Preview
Increases by 17% every quarter (4 times per year).
N(t)
=
Preview
Working with Percents
A lender requires a minimum down payment of 16% of the value of the home. You have
$27,000 cash available to use as a down payment toward a home. Determine the
maximum home value that you can finance.
You can afford to finance a home worth at most s
Round your answer to the nearest dollar.
After graduating from college, Carlos receives two different job offers. Both pay a starting salary of
$73000 per year, but one job promises a $4380 raise per year, while the other guarantees a 5% raise
each year.
Complete the tables below to determine what his salary will be after t years.
Round your answers to the nearest dollar.
1
5
10
15
20
t years
Salary with $4380 raise per year
5
10
15
20
t years
Salary with 5% raise per year