Use the formula for the sum of the first n positive integers to answer the question. 
Pencils are stacked in a triangular shaped pile with one pencil on the top row, two pencils on the second row, etc. If there is a total of 15 pencils, how many are on the bottom row?
A. 6
B. 30
C. 15
D. 5
Answer: D
Mathematics
You might also like to view...
Solve the given problems involving factorial notation.3!
A. 2 B. 9 C. 3 D. 6
Mathematics
Subtract.44 - 44
A. 40 B. 0 C. 1 D. 8
Mathematics
Use a calculator to write the expression as a decimal rounded to three decimal places.
A. 6.782 B. 11.500 C. 2.604 D. 3.583
Mathematics
Write true or false for the statement.A meter is longer than an foot.
A. True B. False
Mathematics