Respuesta :

lol ixl I use it but I am not sure on the answer to this question but i think if you get it wrong on ixl it will explain it not very helpful but meh 
find the change in Nathans scores which is 88.3-86.7 = 1.6. then use the difference and divide by the initial score so 1.6/88.3 and times by hundred to find the percentage. then round the answer.

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