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

The second of three numbers is 1 less than the first. The third number is 5 less than the second. If the first number is twice as large as the third, Find the three numbers. Not algebra but I am really stuck, please help

Q1. which of the points A(-1,2) B(2,13) C (0,3) lie on the line with the equation y=5x + 3? What is the gradient of the line?

Q2.
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