exam Maths Puzzle Numerical Ability

1)12xy^2-108x

2)3a^3b^2+81b^2

3)3x^4-48

4)2x^4+x^2-3

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exam Other Question

please help me graph and solve this equation: Ann leaves Avon at noon biking to Batavia at 16 km/h. At 1 p.m Bill leaves Batavia and bikes toward avon at 20 km/h. If the distance between avon and batavia is 70 km, at what time do ann and bill meet? solve for x:

1) a(x-3)+8=b(x-1)

2) a(3tx-2b)=c(dx-2)