exam Maths Puzzle Numerical Ability

Simplify and reduce to lowest terms

(w/45)+[(3w+2)/30]
and
[1/(10a^3b)]+[4/(ac^3)]

thanks!

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exam Other Question

I need help in solving this equation

solve if possible...

8 - 9t = 21t - 17

I get

- 9t = -9

-t = 1 Hello,

I am stumped on this one please help,

If the area of a circle is 72 cm^2, find the radius to the nearest
hundredth.

Thanks!