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whole number data type

step-by-step explanation:

as whole number type represents whole number

like 1, 2 ,3, 4

in other words the whole numbers are those numbers which cannot be written infraction.

since we can take days as a whole number i.e 1 day 2 day and we cannot write 1.2 day hence we will use whole number data type

(5x-1)^2= (5x)^2-2(5x)×1+(1)^2=25x^2-10x+1

30,40,50 is correct answer