Answer:
Step-by-step explanation:
-3x + 1 + 10x = x + 4
-1 -1
7x = x + 3
-x -x
6x = 3
÷6 ÷6
x = 1/2
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Triangular number sequnce
Part A: 40% are pennies
Part B: NIckels 10, Quarters 20, Pennis 20