book Maths Puzzle Numerical Ability

how do u change kilograms to grams and grams to kilograms

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book Other Question

please help me find the slope of the ff:

a. (9,8) (3,0)
b. (-4,-4) (4,-9)

thank you.
if y varies inversly as x and y=24 when x=8 find y when x=4
y=_____
Thank you can sum one teach me this??????please???????????