exam Maths Puzzle Numerical Ability

Factor the following trinomials

16x^2 + 40xy + 25y^2

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exam Other Question

Divide.

50p^9 q^5/10pq^2
I came up with 5p^9q^3 Is this right?
Problem#1

how can i actually prove it if this is the equation to use.

the problem states:

Prove that if a line has slope ma nd y-intercept b, then an equation of th e