exam Maths Puzzle Numerical Ability

i need to find the sum of the first nth terms of the arithmetric series.
3+8+13+18+23
n=20

Sn=366

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exam Other Question

simplify (show your work)

17.23/0.035 (to one decimal place)

Thanks for the help Write the equation of the line passing through each of the given points with the indicated slope. Give you results in slope-intercept form, where possible.

(0,5),m=-3/5