Series and sigma notation, and the sum of an arithmetic series
Grade 11 Math Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
After row 7, 105; after row 8, 128; after row 25, 825. Ren wants the sum of rows 8 to 25 of a(k) = 2k + 7, using the running totals shown. What is that sum?
After row 9, 243; after row 10, 295; after row 24, 1548. Tala wants the sum of rows 10 to 24 of a(k) = 5k + 2, using the running totals shown. What is that sum?
Zee works out Σ from k = 6 to 30 of (45 − 2k) for math club. What is the sum?
Ari works out Σ from k = 3 to 24 of (60 − 4k) for math club. What is the sum?
Bo works out Σ from k = 4 to 20 of (3k − 20) for math club. What is the sum?
Jun builds a can display. The top row has 3 cans, each row below has 1 more, and the bottom row has 15. How many cans are in the display?
Kira's parents put $10 into a savings fund in week 1, then $4 more each week, ending with a $90 week. How many dollars went in?
The bleachers at Luz's school have 22 seats in the front row, 3 more in each row behind, and 64 in the back row. How many seats are there?
Milo's school hall has 15 rows and 525 seats. Row 1 has 21 seats, and each row has the same number more than the row before. How many seats are in the last row?
A theater has 16 rows and 672 seats. Row 1 has 12 seats, and each row adds the same number of seats. How many seats does Ren find in the last row?