it is a linear equation often used in graphs where you insert a number for x half it then subtract 9 to graph it you use the no. you inserted as x to show a place on the x axis and the answer for its place on the y axis.
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if the number above the bottom number is smaller than half of the bottom number, the fraction is less than half. For example, say the fraction is 3/8, half of the bottom number is 4. 3 is smaller than 4 therefore the fraction is less than half.
It is n3 - 9.
40
The number that 30 is ten less than is 40. Half that is 20. So the question becomes "what number is as much more than 10 is less than 20". This is gobbledygook, but if I rephrase to say "what number is as much more than 10 than 10 is less than 20", then since10 is less than 20 by 10, I guess 20.
Nine less than twice a number equals the same number increased by four?