Is Goblins free for teachers?

Yes. Goblins offers a generous free tier that includes 1 live feedback assignment per week, insights on student mastery and replays, and the ability to upload your own content. The Max plan adds unlimited assignments, superadaptive mode, grade exports, standards growth reports, and SSO/LMS integration, with per-student pricing for schools and districts.

How does Goblins work?

Three simple steps: (1) Share an assignment from thousands of standards-aligned topics using a share code. (2) Students speak and draw their thinking naturally, and Goblins responds with Socratic questioning that sounds just like their teacher. (3) Teachers get real-time formative insights showing what students struggle with and suggestions to inform instruction.

Does Goblins prevent cheating?

Yes. Goblins uses a purpose-trained AI model that evaluates cheating signals in real time. It can detect when students are copying answers, using external tools inappropriately, or not genuinely working through problems. Copy-pasting answers is also blocked.

Can I use my own voice with Goblins?

Yes. Teachers can record their voice and take a selfie to create a custom 3D avatar in about 30 seconds. Students then hear help in their own teacher's voice and see a familiar face, making the experience more personal and effective.

What math levels does Goblins cover?

Goblins covers math from Grade 5 through AP Calculus, including thousands of standards-aligned topics. Teachers can also upload their own content for custom assignments at any level.

Is Goblins FERPA compliant?

Yes. Goblins is FERPA and state compliant. Student data privacy and security are a top priority.

Does Goblins support English Language Learners?

Yes. Goblins supports 30+ languages so teachers don't have to translate every worksheet. It is especially helpful for ELL students who need accessible math instruction in their native language.

F.BF.1a

(9/10) Combine multiple functions to model complex relationships. For example, p(x) = r(x) - c(x); (profit = revenue - cost).

Example Problems

A charity receives online donations

O(t) = 3000 (1.04)^t

dollars and in‑person donations

L(t) = 1500 (1.02)^t

dollars t quarters after a campaign launches.
Let

C

be the campaign's cumulative donations t quarters after launch.
Write a formula for

C(t)

An online ad campaign's click‑through rate

C(t) = 0.06 e^{-0.02 t}

and the number of impressions

L(t) = 80,000 e^{0.01 t}

t

days after launch.
Let

K

be the expected number of clicks t days after launch.
Write a formula for

K(t)

A water tank is being filled by two pumps. Pump 1 adds water at

V_1(t) = 18 t

liters, and Pump 2 at

V_2(t) = 12 t

liters after

t

minutes.
Let T be the total volume of water pumped into the tank after

t

minutes.
Write a formula for

T(t)

Khan Academy Resources

Composing functions Intro to composing functions Find composite functions Model with function combination Evaluate composite functions Model with composite functions Evaluate composite functions: graphs & tables Evaluating composite functions Modeling with composite functions Evaluating composite functions: using tables Intro to composing functions Meaningfully composing functions Evaluating composite functions: using graphs Modeling with composite functions: skydiving Modeling with function combination Finding composite functions Function notation word problem: bank Evaluating composite functions (advanced)

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