exam Maths Puzzle Numerical Ability

PLease help me solve this equation.I am suck.
A line is located at (1,3) and (4,-2).Where is the slope.
I got -5/3
Thank YOu!

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exam Other Question

The percentage of women in the 20-24 are group who have never married went from 55% in 1970 to 73% in 2000. Let 1970 be year 0 and 2000 be year 30.
a) find and interpret the slop
simplify:

[-(-2x^2)^2]^3