Is Nakafa really free?

Yes. Core content and 1 complete Tryout are free. Pro is required to start another Tryout set or repeat one, use premium Nina models, and get 3,000 AI credits each month. Basic learning materials stay free of paywalls.

What AI models can I use?

Everyone can use Nakafa Lite and Nakafa Pro. Credits decide how much you can use each model.

What subjects and grades do you cover?

We cover K-12 through university. Mathematics, Physics, Chemistry, Biology, Computer Science, and more. From elementary basics to advanced university courses.

Yes. We do not sell your data. AI conversations are processed securely. You can delete your chat history anytime. We are privacy-first by design.

Can schools use Nakafa?

Absolutely. We offer custom solutions for classrooms and institutions. Contact founder for LMS integration, student management, and custom branding.

How does Nakafa ensure content accuracy?

All content is created by qualified contributors and reviewed by the community. Our source-available approach means anyone can inspect materials and propose improvements. Practice exercises include explanations so you learn from mistakes, not just scores.

Nakafa

Try Nakafa

Learn until it clicks.

Pick a subject, test what you know with Tryout, and ask Nina when you get stuck.

Explore subjects Try a Tryout

Learning doesn’t stop when you finish reading. Put it to the test with Tryout, see what still feels unclear, then ask Nina without starting over.

Start with the subject you need

After learning, see what you really understood

On 15 November 2019, Indonesia's Minister of Agriculture opened National Mango Innovation Week at the Cukurgondang Agricultural Technology Research and Assessment Installation (IP2TP) in Pasuruan, East Java. The ministry described the event as a forum for sharing mango research and technology.

According to the ministry's publication, Cukurgondang covered $11.87\text{ hectares}$ and held $402$ mango accessions that had been planted there since January $1941$ . The ministry also described it as the world's second-largest mango collection. Those statements concern the research collection and the event; they do not say that community plantations in Pasuruan cultivated every accession in the collection.

Source: Ministry of Agriculture, 15 November 2019 (adapted).

Which statement is not supported by the passage?

Mango accessions had been planted at Cukurgondang since January $1941$ , and the site covered $11.87$ hectares.

National Mango Innovation Week was held at IP2TP Cukurgondang in Pasuruan, East Java.

The ministry described Cukurgondang as the world's second-largest mango collection.

Community plantations in Pasuruan cultivated every accession in the Cukurgondang collection.

The event served to disseminate mango research and technology.

If you are still unsure, Nina already knows which part you mean

For the operation $\triangle(a,b)=ka+\frac{b}{m}$ , we know $\triangle(2,4)=8$ and $\triangle(3,5)=11$ . How do I find $\triangle(5,9)$ ?

Subtract the first equation from the second:

$k+\frac{1}{m}=3$

Because $k$ and $m$ are positive integers, $\frac{1}{m}$ can only be an integer when $m=1$ . That makes $k=2$ .

Put both values into the final operation:

$\triangle(5,9)=5(2)+\frac{9}{1}=19$

So $\triangle(5,9)=19$ .

Motion becomes easier to understand when you can see it for yourself

Horizontal component: $v_{0x}=20\text{ m/s}$
Vertical component: $v_{0y}=34.6\text{ m/s}$
Peak time: $t=3.5\text{ s}$
Flight time: $T=6.9\text{ s}$
Range: $R=138.6\text{ m}$
Velocity at two seconds: $\vec{v}=\langle 20, 14.6\rangle\text{ m/s}$

Your curriculum may differ. Your learning still stays connected.

Start from your school pathway. Lessons, Tryout, and Nina follow the curriculum you use.

Explore all curricula

You do not have to take our word for it. Follow the lesson back to its sources.

Read the explanation, follow its references, or open the source when you want to check how it was built.

Open this lesson

Human

Open lesson

From Paper to Pandemic

Have you ever imagined folding a sheet of paper $42 \text{ times}$ ? If it were possible to do so, its thickness would exceed the distance from Earth to the Moon! This is because each fold doubles the thickness of the paper, this is what we call exponential growth.

Exponential growth occurs when something increases by a constant multiplier in each time interval. In early $2020$ , the world experienced a real example of exponential growth through the spread of the COVID-19 virus. One infected person could transmit to two people, then four, eight, and so on.

Definition of Exponents

An exponent is a shorthand way to write repeated multiplication. Imagine you are calculating how many people are infected with a virus like COVID-19. At each transmission phase, the number of infected people will increase in an interesting pattern:

1 = 2^0 \quad 2 = 2^1 \quad 4 = 2 \times 2 = 2^2 \quad 8 = 2 \times 2 \times 2 = 2^3 \quad 16 = 2 \times 2 \times 2 \times 2 = 2^4

Agent

Open .md

## From Paper to Pandemic

Have you ever imagined folding a sheet of paper <InlineMath math="42 \text{ times}" />? If it were possible to do so, its thickness would exceed the distance from Earth to the Moon! This is because each fold doubles the thickness of the paper, this is what we call **exponential growth**.

Exponential growth occurs when something increases by a constant multiplier in each time interval. In early <InlineMath math="2020" />, the world experienced a real example of exponential growth through the spread of the COVID-19 virus. One infected person could transmit to two people, then four, eight, and so on.

## Definition of Exponents

An exponent is a shorthand way to write repeated multiplication. Imagine you are calculating how many people are infected with a virus like COVID-19. At each transmission phase, the number of infected people will increase in an interesting pattern:

<BlockMath math="1 = 2^0 \quad 2 = 2^1 \quad 4 = 2 \times 2 = 2^2 \quad 8 = 2 \times 2 \times 2 = 2^3 \quad 16 = 2 \times 2 \times 2 \times 2 = 2^4" />

We were students too. We know what it is like to choose between learning and eating. Core access is free. Always.

Free

Start learning at your own pace

Access to hundreds of learning materials

Practice questions with detailed explanations

10 AI credits each day for the basic AI tutor

1 complete tryout for free

Community access on Discord

Start Learning

Pro

For a more intensive study routine.

Everything in Free, plus:

3,000 AI credits each month for premium Nina models

Start another Tryout set or repeat one, with IRT scoring on supported sets and detailed explanations

Priority support when you need guidance

For Schools

Every school has different needs. We get it.

Need an LMS, content integration, or a custom classroom flow? Pick what works for your school.

Discuss your needs

Support

Still have questions?

Cannot find what you need? Reach out to us directly.

Contact founder

Find people who get what you are learning

Join community

Every lesson is made by someone who was confused too. Join our Discord to ask questions, share resources, or help others out.

## From Paper to Pandemic Have you ever imagined folding a sheet of paper <InlineMath math="42 \text{ times}" />? If it were possible to do so, its thickness would exceed the distance from Earth to the Moon! This is because each fold doubles the thickness of the paper, this is what we call **exponential growth**. Exponential growth occurs when something increases by a constant multiplier in each time interval. In early <InlineMath math="2020" />, the world experienced a real example of exponential growth through the spread of the COVID-19 virus. One infected person could transmit to two people, then four, eight, and so on. ## Definition of Exponents An exponent is a shorthand way to write repeated multiplication. Imagine you are calculating how many people are infected with a virus like COVID-19. At each transmission phase, the number of infected people will increase in an interesting pattern: <BlockMath math="1 = 2^0 \quad 2 = 2^1 \quad 4 = 2 \times 2 = 2^2 \quad 8 = 2 \times 2 \times 2 = 2^3 \quad 16 = 2 \times 2 \times 2 \times 2 = 2^4" />

Learn until it clicks.

Students from these schools and universities learn with Nakafa.

Learning doesn’t stop when you finish reading. Put it to the test with Tryout, see what still feels unclear, then ask Nina without starting over.

Start with the subject you need

After learning, see what you really understood

If you are still unsure, Nina already knows which part you mean

Motion becomes easier to understand when you can see it for yourself

Your curriculum may differ. Your learning still stays connected.

You do not have to take our word for it. Follow the lesson back to its sources.

From Paper to Pandemic

Definition of Exponents

We were students too. We know what it is like to choose between learning and eating. Core access is free. Always.

Free

Pro

Every school has different needs. We get it.

Still have questions?

Find people who get what you are learning

Learn until it clicks.

Students from these schools and universities learn with Nakafa.

Learning doesn’t stop when you finish reading. Put it to the test with Tryout, see what still feels unclear, then ask Nina without starting over.

Start with the subject you need

After learning, see what you really understood

If you are still unsure, Nina already knows which part you mean

Motion becomes easier to understand when you can see it for yourself

Your curriculum may differ. Your learning still stays connected.

You do not have to take our word for it. Follow the lesson back to its sources.

From Paper to Pandemic

Definition of Exponents

We were students too. We know what it is like to choose between learning and eating. Core access is free. Always.

Free

Pro

Every school has different needs. We get it.

Still have questions?

Find people who get what you are learning

Learn until it clicks.

Students from these schools and universities learn with Nakafa.

Learning doesn’t stop when you finish reading. Put it to the test with Tryout, see what still feels unclear, then ask Nina without starting over.

Start with the subject you need

After learning, see what you really understood

If you are still unsure, Nina already knows which part you mean

Motion becomes easier to understand when you can see it for yourself

Your curriculum may differ. Your learning still stays connected.

You do not have to take our word for it. Follow the lesson back to its sources.

From Paper to Pandemic

Definition of Exponents

We were students too. We know what it is like to choose between learning and eating. Core access is free. Always.

Free

Pro

Every school has different needs. We get it.

Still have questions?

Is Nakafa really free?

What AI models can I use?

What subjects and grades do you cover?

Is my data private?

Can schools use Nakafa?

How does Nakafa ensure content accuracy?

Find people who get what you are learning

Learn until it clicks.

Students from these schools and universities learn with Nakafa.

Learning doesn’t stop when you finish reading. Put it to the test with Tryout, see what still feels unclear, then ask Nina without starting over.

Start with the subject you need

After learning, see what you really understood

If you are still unsure, Nina already knows which part you mean

Motion becomes easier to understand when you can see it for yourself

Your curriculum may differ. Your learning still stays connected.

You do not have to take our word for it. Follow the lesson back to its sources.

From Paper to Pandemic

Definition of Exponents

We were students too. We know what it is like to choose between learning and eating. Core access is free. Always.

Free

Pro

Every school has different needs. We get it.

Still have questions?

Is Nakafa really free?

What AI models can I use?

What subjects and grades do you cover?

Is my data private?

Can schools use Nakafa?

How does Nakafa ensure content accuracy?

Find people who get what you are learning