Question

A positive integer is subtracted from its square. The units digit of the result could be which of the following?

a. 3
b. 4
c. 5
d. 6
e. 7

Answer 1

i would start with testing some positive integers and look for a pattern

Answer 2

1^2-1 = 0
2^2-2 = 2
3^2-3 = 6
4^2-4 = 12
5^2-5 = 20
6^2-6 = 30
7^2-7 = 42
8^2-8 = 56
....


units digit is always 0, 2, or 6
since 0 and 2 are not there in your options, go with 6

Answer 3

whats units digit? :[

Answer 4

ofcourse 6, are you preparing for SAT ?

Answer 5

yes :[

Answer 6

okie good luck :)

Answer 7

thx :]

Answer 8

np :)

Answer 9

:]