exam Maths Puzzle Numerical Ability

how do you simplify 4(3 x 10^5) then write it in scientific notation?

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exam Other Question

how do you factor this

2a^2-4ab^2-ab if 1ST is one tile and 2nd is three tiles , 3rd is five tiles ,4th is seven tiles. write an equation for the number of tiles,t, needed to make the nth figure.