exam Maths Puzzle Numerical Ability

I need to write a rule for finding the ones digit in any power of 7.

the ones place pattern repeats 7,9,3,1,7,9,3,1

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exam Other Question
Evaulate the expression when x= -3/8 and y= 7/12.

28. y - x

Any help with this equation would be GREATLY</b> appreciated. 12x^2(x-4)^3=0