book Maths Puzzle Numerical Ability

How do you find the line that has a slope of 1/4 and passes the points (3,1)?

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book Other Question

An object is projected upward from the top of a tower. Its distance
in feet above the ground after t seconds is given by s(t)=-16t^2+64t+80. How many seconds will it take to reach ground
level? can you please help me to factorize the following
1. a^2(b+c)+b^2(c+a)+c^2(a+b)+2abc

2. ab(a^2-b^2)+bc(b^2-c^2)+ca(c^2-a^2)

3. Use factor theorem to prove ;(x+y+z)^3-(y+z-x)^3-(z+x-y)^3-(x+y-z)=24xyz