Answer:
What Is Mass? Mass is a constant unit of the amount of matter an object possesses. It stays the same no matter where the measurement is taken. The most common units for mass are the kilogram and gram.
Step-by-step explanation:
Steve has x+500 marbles
richard has x marbles
if steve gives richard 300 marbles then
x+500-300 x+300
so x+200 and x+300
richard has more and by 100
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Add 5ft 7in and 4ft 8in together
5ft 7in + 4ft 8in = 10ft 3in