307
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Do you mean "what could you multiply to get 280 and add to get -27"? If so, then it can only be done with complex numbers:
ab = 280
a + b = -27
∴ b = -27 - a
∴ a(-27 - a) = 280
∴ -a2 - 27a = 280
∴ a2 + 27a + (27/2)2 = -280 + (27/2)2
∴ (a + 27/2)2 = -280 + 729/4
∴ (a + 27/2)2 = (729 - 1120)/4
∴ (a + 27/2)2 = -391/4
∴ a + 27/2 = ± i√391 / 2
∴ a = (-27 ± i√391) / 2
Easy just divide 280 / 175 then multiply by 100 = 62.5%
To find the number that is 15% of 280, multiply 280 by 0.15 (the equalent of 15% in decimal form). The answer is 42.
To find the percentage of 280 out of 350, you would divide 280 by 350 and then multiply by 100. So, 280 divided by 350 is 0.8, and when multiplied by 100, you get 80%. Therefore, 280 is 80% of 350.
-307
140 multiplied by 2 28 multiplied by 10 There are many more ways to multiply to get 280.