Your rate of change would be 3/4 lb/week.
You could model this with a linear eq:
y = 8+ 3/4x
Hi hope I help, so first 123×20 which = 2,460 then, 2,460×31 and the answer is 76,260
8100/6 = 5400/x
cross multiply
8100x = 32400
x = 32400/8100
x = 4......4 years old
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Quantitative Information is expressed using numbers
The answer is exactly one