๐๐ผA book weighs 200g to the nearest 10g. What is the upper bound of the total weight of 20 books?

๐๐ผSimplify $\frac {(6x^{\frac{1}{2}})^3}{2x}$

๐๐ผA line has a gradient of and passes through the point (3,10). What is its equation? Write an equation for another line that is **perpendicular** to line 1.

๐๐ผA is directly proportional to B squared. When A=500, B=10. Find A when B=20.

๐๐ผCalculate