To answer the question, you need to count backwards from 15 to 6 and add up the pieces of chalk. 15+14+13+12+11+10+9+8+7+6=105. That means there are 105 pieces of chalk in the pile. Hope this helps.
-x + 6x - 1 - (3x - 4x - 1)
-x + 6x - 1 - 3x + 4x + 1
5x - 3x + 4x - 1 + 1
6x
(f-g)(x) = 6x
The answer is c because it’s values and
The question says kilograms every minutes, so it's C or D. The answers on A and B same