Canonical combined lesson MATH30B-L072 · week 15 day 2 · CURRICULUM_BASELINE

MATH30B-L072 - Original mixed: explog; explog data; vehicle/business

• Delivery id: MATH30B (combined classroom; not a fourth credential)
• Official courses: Mathematics 30-1 (MAT3791), 30-2 (MAT3792), 30-3 (MAT3793)
• Lesson ID: MATH30B-L072
• Calendar: Week 15 Day 2 of 18 weeks × 5 days (lesson 72 of 90)
• Object type: canonical combined-classroom lesson
• Braid class: C
• Labels: ALL STRANDS launch → 30-1 REQUIRED / 30-2 REQUIRED / 30-3 REQUIRED workshops → CROSS-STRAND EXPOSURE ≠ mastery
• Source: Alberta Mathematics 10-12 Program of Studies, https://open.alberta.ca/publications/mathematics-grades-10-12
• Official outcome IDs today: MATH30-1-TRIGONOM-07-013, MATH30-1-TRIGONOM-08-014, MATH30-1-TRIGONOM-09-015, MATH30-1-TRIGONOM-10-016, MATH30-2-LOGICALR-04-012, MATH30-2-RELATION-05-013, MATH30-2-RELATION-06-014, MATH30-3-X-02-006, MATH30-3-X-03-007

Labels (post on the board)

1. ALL STRANDS - shared launch only.
2. 30-1 REQUIRED - MAT3791 tray; mastery evidence for 30-1 SOs listed below.
3. 30-2 REQUIRED - MAT3792 tray; mastery evidence for 30-2 SOs listed below.
4. 30-3 REQUIRED - MAT3793 tray; mastery evidence for 30-3 SOs listed below.
5. CROSS-STRAND EXPOSURE ≠ mastery - hearing another tray is logged as EXPOSURE, never as an SO tick, never as a silent enrolment change.

ALL STRANDS launch (~10-14 min)

Exact-first for 30-1. Context/tech for 30-2. Consumer math for 30-3.

Clock ~75 min unless the school uses 60; cut the workshop block first, never the strand exit ticket. Class C parallel workshops are the default when one strand is on exclusive work.

Official outcomes (REQUIRED on home strand)

Strand	Official ID	Role today
30-1	MATH30-1-TRIGONOM-07-013	REQUIRED - Demonstrate an understanding of logarithms
30-1	MATH30-1-TRIGONOM-08-014	REQUIRED - Demonstrate an understanding of the product, quotient and power laws of logarithms
30-1	MATH30-1-TRIGONOM-09-015	REQUIRED - Graph and analyze exponential and logarithmic functions
30-1	MATH30-1-TRIGONOM-10-016	REQUIRED - Solve problems that involve exponential and logarithmic equations
30-2	MATH30-2-LOGICALR-04-012	REQUIRED - Demonstrate an understanding of logarithms and the laws of logarithms
30-2	MATH30-2-RELATION-05-013	REQUIRED - Solve problems that involve exponential equations
30-2	MATH30-2-RELATION-06-014	REQUIRED - Represent data, using exponential and logarithmic functions, to solve problems
30-3	MATH30-3-X-02-006	REQUIRED - Solve problems that involve the acquisition of a vehicle by: • buying • leasing • leasing to buy
30-3	MATH30-3-X-03-007	REQUIRED - Critique the viability of small business options by considering: • expenses • sales • profit or loss

30-1 workshop - 30-1 REQUIRED

Clock: ~22-28 min after launch (cut workshop before cutting the strand exit ticket). Learners on this tray stay on 30-1.

MATH30-1-TRIGONOM-07-013

Official text: Demonstrate an understanding of logarithms

Worked example (unique to this hour, this strand, this SO): Rewrite 4^4=256 in log form. Evaluate log_4(4) exactly. Explain log_41=0 and why log_4(−5) is not real.

Level	Prompt (inside the home strand)
FOUNDATION	log_10 1000.
CORE	Convert b^x=a to log form.
PROFICIENT	Exact log of a power of the base.
ADVANCED	Change-of-base preview.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. VIS-M30-EXPLOG: y=b^x and y=log_b x as inverse graphs.

MATH30-1-TRIGONOM-08-014

Official text: Demonstrate an understanding of the product, quotient and power laws of logarithms

Worked example (unique to this hour, this strand, this SO): Expand log_4(x^5 y) for x,y>0: 5 log_4 x + log_4 y. Condense log_4 4 − log_4 1 + 5 log_4 4. Reject the illegal step log u + log v = log(u+v) with a counter-example using 4 and 5.

Level	Prompt (inside the home strand)
FOUNDATION	One law: log(xy).
CORE	Expand or condense mixed laws.
PROFICIENT	Justify each step.
ADVANCED	Counter-example to log(u+v).

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. Log-law cards (product, quotient, power) posted after retrieval.

MATH30-1-TRIGONOM-09-015

Official text: Graph and analyze exponential and logarithmic functions

Worked example (unique to this hour, this strand, this SO): Graph y=4^x and y=log_4 x. State intercepts, asymptotes, and domain/range. Compare to y=4^{x−1}+5.

Level	Prompt (inside the home strand)
FOUNDATION	Intercept of y=2^x.
CORE	Asymptote and domain of log.
PROFICIENT	Describe a transformed explog graph.
ADVANCED	Compare two bases on one axes.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. Exp and log graphs with intercepts, asymptotes, and end behaviour.

MATH30-1-TRIGONOM-10-016

Official text: Solve problems that involve exponential and logarithmic equations

Worked example (unique to this hour, this strand, this SO): Solve 4^x = 4 exactly (x=log_4 4) then a decimal check. Solve log_4(x−1)+log_4 x = log_4 4 with domain x>1 (and x>0). Reject extraneous roots.

Level	Prompt (inside the home strand)
FOUNDATION	Solve 2^x=8.
CORE	Exact then tech check.
PROFICIENT	Log equation with domain.
ADVANCED	Extraneous root rejected.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. Equation-graph link: intersection of y=b^x and y=k.

Independent practice: a new instance of today’s SO(s) with different numbers than the worked example. Two sentences on reasonableness.

Wrong-answer repair (do not praise):

• 30-1 SO 013: Writing log_b a = b^a, or logging a negative as if it were real. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.
• 30-1 SO 014: log u + log v = log(u+v), or bringing an exponent across a sum inside a log. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.
• 30-1 SO 015: Drawing y=log_b x with a y-intercept of 1, or an asymptote on the y-axis forgotten. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.
• 30-1 SO 016: Exponentiating only one side, or keeping an extraneous root from a log domain. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.

30-2 workshop - 30-2 REQUIRED

Clock: ~22-28 min after launch (cut workshop before cutting the strand exit ticket). Learners on this tray stay on 30-2.

MATH30-2-LOGICALR-04-012

Official text: Demonstrate an understanding of logarithms and the laws of logarithms

Worked example (unique to this hour, this strand, this SO): Users grow from 70 at annual factor 1.04. Write a log to find years to reach 210. Apply one product or power law in the setup, then a technology check. Not 30-1 exact-only demand.

Level	Prompt (inside the home strand)
FOUNDATION	Meaning of log in a growth sentence.
CORE	One law in a story.
PROFICIENT	Tech check after setup.
ADVANCED	Reasonableness limits.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. VIS-M30-EXPLOG in a growth story (not 30-1 exact-only demand).

MATH30-2-RELATION-05-013

Official text: Solve problems that involve exponential equations

Worked example (unique to this hour, this strand, this SO): Solve 1.04^t = 3 using logs or tech after a table guess. State what the solution means for the water-enterprise users and one model limit.

Level	Prompt (inside the home strand)
FOUNDATION	Guess-check table for a^t=k.
CORE	Log or tech solve.
PROFICIENT	Model limits.
ADVANCED	Compare two growth models.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. Table-to-equation growth model.

MATH30-2-RELATION-06-014

Official text: Represent data, using exponential and logarithmic functions, to solve problems

Worked example (unique to this hour, this strand, this SO): Given points (0,14), (1,14), (2,15), choose exponential vs linear and write a model in words plus an equation. Residual: one point off by 4.

Level	Prompt (inside the home strand)
FOUNDATION	Table to graph.
CORE	Choose exp vs linear.
PROFICIENT	Fit language.
ADVANCED	Residual talk.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. Scatter + exponential/log model VIS-M30B-DATA.

Independent practice: a new instance of today’s SO(s) with different numbers than the worked example. Two sentences on reasonableness.

Wrong-answer repair (do not praise):

• 30-2 SO 012: Applying 30-1 exact-only demands as if they were this SO, or illegal log sums. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.
• 30-2 SO 013: Reporting a negative time without checking the model. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.
• 30-2 SO 014: Forcing a linear model on clearly exponential data. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.

30-3 workshop - 30-3 REQUIRED

Clock: ~22-28 min after launch (cut workshop before cutting the strand exit ticket). Learners on this tray stay on 30-3.

MATH30-3-X-02-006

Official text: Solve problems that involve the acquisition of a vehicle by: • buying • leasing • leasing to buy

Worked example (unique to this hour, this strand, this SO): Vehicle price $19000. Buy: tax 5% + $280 fees. Lease: $280/month for 36 months + $1520 due at signing, residual $7600. Lease-to-buy: add a stated buyout. Compare total cost vs monthly cash flow. Table after retrieval.

Level	Prompt (inside the home strand)
FOUNDATION	Define buy / lease / lease-to-buy.
CORE	Total cost vs monthly.
PROFICIENT	Choose with a cash-flow condition.
ADVANCED	Interest/residual sensitivity.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. Vehicle comparison table VIS-M30B-VEH (buy / lease / lease-to-buy).

MATH30-3-X-03-007

Official text: Critique the viability of small business options by considering: • expenses • sales • profit or loss

Worked example (unique to this hour, this strand, this SO): Month expenses $2340, sales $2900, so profit/loss = sales − expenses. Second scenario: sales drop 12%. Critique viability (can this hygiene kiosk continue?).

Level	Prompt (inside the home strand)
FOUNDATION	Label expense vs revenue.
CORE	Compute profit or loss.
PROFICIENT	Critique viability.
ADVANCED	Two scenarios.

Diagram: Timing: after retrieval, before independent practice. Do not open the diagram during the first retrieval prompt. Ledger: expenses, sales, profit or loss.

Independent practice: a new instance of today’s SO(s) with different numbers than the worked example. Two sentences on reasonableness.

Wrong-answer repair (do not praise):

• 30-3 SO 006: Comparing monthly payment only, ignoring down payment, residual, or term length. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.
• 30-3 SO 007: Calling revenue “profit,” or ignoring a category of expense. Repair: name the first wrong line, replace it, and re-complete the CORE tray item. Do not praise the wrong line.

CROSS-STRAND EXPOSURE ≠ mastery

• CROSS-STRAND EXPOSURE ≠ mastery. Log D items. Do not tick another strand’s SO.
• AI Tutor must not treat an exposure card as proficiency.

Project or clean math

Project overlay today: none. Use a clean math prompt on the home-strand tray. Do not force Sustainable Community Water & Hygiene onto work that is not genuinely that mathematics.

AI Tutor

• Load the authorized home strand only: MAT3791 (Mathematics 30-1) or MAT3792 (Mathematics 30-2) or MAT3793 (Mathematics 30-3) from the authorized profile.
• Never silent-switch a struggling 30-1 learner into 30-2/30-3 banks (or the reverse) to “make it easier.”
• Serve today’s home-strand SOs. Exposure cards are read-only.
• Never dump diploma keys or released exam wording. Original items only.
• Wrong answers: name the error and repair; do not praise.

Human-tutor handoff

Call a human tutor when: the learner cannot complete CORE after two documented repairs; an identity proof (30-1 006) is stuck after the identity map; a 30-2 017 source is unsafe or empty; a 30-3 vehicle/business number is being faked to match a hoped-for answer; distress, disclosure, or a request to change official enrolment. Enrolment changes are an office/PASI process, not a tutor action.

Diagram / whiteboard

Approved starter math30-quadratic-shift. Strand workshops may add axes/tables. Never praise a translated parabola as a circle.

Strand exit ticket (~8-12 min)

Collect only the home-strand row. Exposure ≠ mastery. Lesson MATH30B-L072.

Home strand	Primary SO	Exit ticket (unique to this lesson)
30-1	MATH30-1-TRIGONOM-07-013	CORE exit: Rewrite 4^4=256 in log form. Evaluate log_4(4) exactly. Explain log_41=0 and why log_4(−5) is not real. FOUNDATION alternate: log_10 1000. Do not submit another strand’s ticket as 30-1 mastery.
30-2	MATH30-2-LOGICALR-04-012	CORE exit: Users grow from 70 at annual factor 1.04. Write a log to find years to reach 210. Apply one product or power law in the setup, then a technology check. Not 30-1 exact-only demand. FOUNDATION alternate: Meaning of log in a growth sentence. Do not submit another strand’s ticket as 30-2 mastery.
30-3	MATH30-3-X-02-006	CORE exit: Vehicle price $19000. Buy: tax 5% + $280 fees. Lease: $280/month for 36 months + $1520 due at signing, residual $7600. Lease-to-buy: add a stated buyout. Compare total cost vs monthly cash flow. Table after retrieval. FOUNDATION alternate: Define buy / lease / lease-to-buy. Do not submit another strand’s ticket as 30-3 mastery.

Provenance

Official IDs/text: _official_math_calm_outcomes.json. Pacing: MATH30_COMBINED_CLASSROOM_PACING.md. Crosswalk: MATH30_1_30_2_30_3_OUTCOME_CROSSWALK.csv. Generated by oeom/core/training/rapid3/write_math30b_lessons.py.