Look at the answers and be logical, try rounding up so instead of 45% try 50% now 22.5 would be half the number, have a look at the answers and see what is closest to double 22.5. C looks reasonable. Hope I helped, have a nice day :)
if x itself goes up by one, wouldn't you think 4x is your answer, because that is your answer
To find the terms, multiply by .5
5, .5 times 5 = 2.5, .5 times 2.5 = 1.25, .5 times 1.25 = .625, .5 times .625 = .3125
First method: use a calculator second method do it on paper
By multiplying the round with the decimal number and you get the nearest degree