Last updated: October 22, 2026 · Written by the Math Made Easy math teachers

The last problems use theater seating, savings, a bouncing ball and medicine doses.
Standards: A-APR.C.5, A-SSE.B.4, F-BF.A.2 · Level: Grade 12 Precalculus
Problem 2 Writing Sigma Notation ★★★
Write 4 + 7 + 10 + 13 + 16 in sigma notation.
Problem 3 An Arithmetic Series ★★★
Find the sum 7 + 11 + 15 + … + 51.
Problem 4 A Geometric Series ★★★
Add up the first seven terms of the geometric sequence that begins 4, 12, 36, and so on. Use the sum formula.
Problem 5 An Infinite Sum ★★★
The chart shows the partial sums of 9 + 6 + 4 + 83 + …. Find the sum of the series.
Problem 6 Divergent or Not? ★★★
Does 8 + 9.6 + 11.52 + … have a sum? Explain.
Problem 7 How Many Terms? ★★★
An arithmetic series has first term −4 and common difference 3. Its sum is 217. Find the number of terms.
Problem 8 An Alternating Sum ★★★
Evaluate ∑k=17 5(−2)k−1.
Problem 9 A Repeating Decimal ★★★
Write 0.272727… as an infinite geometric series and find the fraction it equals.
Problem 10 An Alternating Infinite Series ★★★
Find ∑k=1∞ 6(−12)k−1.
Problem 11 Pascal’s Triangle Expansion ★★★
Use row 5 of Pascal’s triangle to expand (x + 2)⁵.
Problem 12 Expanding with a Coefficient ★★★
Expand (2x − 3)⁴.
Problem 13 A Single Coefficient ★★★
Find the coefficient of x³ in the expansion of (x + 4)⁷.
Problem 14 A Limit from a Table ★★★
Let f(x) = x² − 9x − 3. (a) Complete the table of values. (b) Find limx→3 f(x) and explain why f(3) does not exist.
| x | 2.9 | 2.99 | 2.999 | 3.001 | 3.01 |
|---|---|---|---|---|---|
| f(x) | ? | ? | ? | ? | ? |
Problem 15 Theater Seating ★★★
A theater has 18 rows. The first row has 14 seats and each row after it has 2 more seats than the row before. (a) How many seats are in row 18? (b) How many seats are there in all?
Problem 16 Monthly Savings Plan ★★★
A student deposits $40 in month 1 and increases each month’s deposit by 5% over the previous month, for 24 months. Find the total deposited, to the nearest cent.
Problem 17 Bouncing Ball ★★★
A ball is dropped from 10 feet. After each bounce it rises to 70% of the height of the previous fall. Find the total distance it travels before it comes to rest, to the nearest hundredth.
Problem 18 Medicine Dosage ★★★
A patient takes a 200 mg dose each morning. By the next morning, 30% of the drug from the previous day is still in the body. (a) Find the amount in the body right after the first, second and third doses. (b) Find the long-run amount right after a dose.
Problem 19 A Special Term ★★★
In the expansion of (x² + 1x)⁶, find (a) the constant term and (b) the coefficient of x³.
Problem 20 Limits of a Function and a Sequence ★★★
Find (a) limx→−1 x³ + 1x + 1 and (b) limn→∞ 6n² + 52n² − n + 3. (c) Explain why part (a) can have a limit even though the expression is undefined at x = −1.
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