Math 3 Honors - Quiz #3

The price of a car that was bought for $10,000 and has depreciated 10% yearly. Find the price of the car 8 years later.

Which is not true?

• This is exponential decay.

• A₀=10000

• r=0.010

• t=8

The equation for the price of a baseball card that was bought for 5 dollars and has appreciated 5% yearly.

What does r=?

• r=5

• r=0.5

• r=0.05

The equation for the price of a baseball card that was bought for 5 dollars and has appreciated 5% yearly. Find the value of the card 25 years later.

Which equation is correct?

• A(25)=5(1+5)²⁵

• A(25)=5(1-5)²⁵

• A(25)=5(1+0.05)²⁵

• A(25)=5(1-0.05)²⁵

A town of 3200, grows at a rate of 25% every year. Find the size of the city in 10 years.

• 29802 people

• 180 people

• 8300 people

• 34671 people

Middletown High School has student elections every year. Lately, the school has seen a 5% decrease in voting from election to election. If 910 students voted this year, how many will be expected to vote 8 years from now? (Round to the nearest whole number if necessary).

• 604

• 777

• 29

• 198

More and more people are purchasing food from farmers' markets. As a consequence, a market researcher predicts that the number of farmers' markets will increase by 15% each year. If there are 6,200 farmers' markets this year, how many will there be in 10 years? (Round to the nearest whole number if necessary).

• 25,082

• 12,937

• 62,000

• 43,511

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g
• 0.25mg
• 0.3g
• 0.25g

Barium-122 has a half-life of 2 minutes. If after 10 minutes a sample of 15.0 g is left, what mass must have been initially present?

• 30 g

• 480 g

• 240 g

• 120 g

The number of mosquitoes at the beginning of the summer was 4,000. The population of mosquitoes is expected to grow at a rate of 25% a month. How many mosquitoes will there be after 4 months?

• 9766
• 9006
• 9765
• 5433

Write an equation that models the following situation:
Samantha's hair was known to grow very rapidly. It began at a length of 6 in and grew at a rate of 14% a week.

• y=6(0.14)^x
• y=6(1+14)^x
• y=6(1.14)^x
• y=6(0.86)^x