Skip to content
Marlbridge

AP® Calculus AB · Unit 6 · Topic 6.5

Interpreting the Behavior of Accumulation Functions Involving Area: Topic Checklist (Calculus AB 6.5)

Specific “I can…” statements for reading the behaviour of an accumulation function from its integrand, each linked to the guide section and practice question that tests it.

Work through the list without notes or a calculator. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions. This topic is shared by Calculus AB and Calculus BC.

Understanding

  • I can explain why a graph of f is really a graph of g′ when g(x) = ∫ (a to x) f(t) dt. (Guide: “The big idea”)
  • I can say which feature of f gives each feature of g: sign for increasing, slope for concavity, area for values. (Guide: “How features of f show up in g”; Practice Q1)
  • I can explain why a zero of f without a sign change gives no extremum of g. (Guide: feature table; Practice Q3, Q7(b))
  • I can explain why a corner in f can still give a point of inflection of g. (Guide: Worked example 1(c))

Skills

  • I can find the intervals where g increases or decreases from a graph, a formula or a sign description of f. (Guide: Worked examples 1 and 2; Practice Q2, Q5(b))
  • I can find the points of inflection of g from where f changes between increasing and decreasing. (Guide: Worked examples 1(c) and 2(b); Practice Q5(c), Q7(c))
  • I can find values of g with signed areas, including values to the left of the starting point. (Guide: Worked example 1(d); Practice Q5(a))
  • I can use the candidates test to find the absolute extrema of g on a closed interval. (Guide: Worked example 1(d); Practice Q4, Q5(d))
  • I can estimate a value of an accumulation function from a table with a trapezoidal sum. (Guide: Worked example 3(d); Practice Q6(d))

Reasoning

  • I can justify every claim about g with a reason about g′ = f or g″ = f′, not about g itself. (Guide: “How to justify a claim about g”)
  • I can use the Intermediate Value Theorem, with stated facts about f, to locate and count the critical points of g from a table. (Guide: Worked example 3(b); Practice Q6(b))
  • I can interpret the rate and the accumulated amount in context, with units. (Practice Q6(a))

All ticked? Move on to Topic 6.6, Applying Properties of Definite Integrals, or return to the Calculus AB roadmap or the Calculus BC roadmap.

AP® and Advanced Placement® are trademarks registered by the College Board, which is not affiliated with, and does not endorse, this website. Marlbridge is an independent tuition provider. It is not an authorized AP course provider, an AP school or an exam centre, and these resources are not official College Board materials. Reading them or doing simulations does not meet the laboratory requirement of an AP science course.