# Exponential function - practice problems

Direction: Solve each problem carefully and show your solution in each item.#### Number of problems found: 170

- The population 4

The population of a city is decreasing at a rate of 2% per year. The population in 2002 was 700,000. What would be the population in 2009? - Interest over time

If certain sum at compound interest becomes double in 5 years, then, in how many years, it will be 16 times at the same rate of interest? - An apple 2

An apple tree was planted two years ago. It increases at the rate of 20% every year .If at present, the height of the tree is 540 cm, what was it when the tree was planted? - Person A,B

Person A takes 3000 USD from person B for 2 yrs at the rate of 10% half yearly interest. What amount will be paid by person A to B after the end 2 yr?

- A population

A population of fish starts at 8,000 and decreases by 6% per year. Use an exponential function to find the population of fish in 10 years. - The enrolment 2

The enrolment at a school has increased from 1400 learners to 1600 learners over 5 years. What is the percentage increase in enrolment? - HCF of polynoms

Find the HCF of the given expression: 2a²b²c^{4}, 2a^{4}b³c³ and 4a²b³ - Compound interest

Joel borrowed $3208.5 on November 2, 2021, at 3.6% p.a. How many days would it take for him to repay the loan if he made a payment of $ 3,720.34? Round up to the nearest day. - The sum 41

The sum of 640.00 was deposited in the first bank for five years, and the interest given was 160.00. Find the rate.

- Exp decay

An element with a mass of 780 grams decays by 16.3% per minute. How much of the element is remaining after 16 minutes, to the nearest 10th of a gram? - The balance 2

If your balance at the end of 4 years is 50000, at a 5% interest rate, What was your original investment? - Flower series

Every day, the flower develops two new flowers, and each of these new blossoms also bears two flowers each day. After eight days, how many blooms are already present in the garden? - A company 2

A company invests 51000. After 4 years of growth at the same rate each year, the investment is worth 68920. Find the annual growth rate as a percentage. - In 1970

In 1970 the population was 24,000. In 1980 the population was 28,800. By what percent did the population increase?

- Robinson 82579

Robinson Crusoe came to the island with 4 grains of corn. How many years did it take him to grow enough grain for bread if he got 10 grains from one grain on average and he needed at least 1kg of bole for 1 bread, and 1 grain weighs about 0.2g? (assume on - Beginning 82198

At the end of the year, the lady had 360,009 CZK in her account with added interest. What was the amount at the beginning of the year if the interest rate was 10.5% pa? - Saving problem

We want to save €25,000. We deposit €3,000 annually, and the interest is 4.4% (interest tax is 19%). How many years do we have to save? - Principal 82010

Calculate the interest rate if the principal amount of 500 is 5 euros in interest in 5 months. - Increases 81991

What % of bacteria will increase hourly if the number increases from 100,000 to 370,000 in 5 hours?

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