exam Maths Puzzle Numerical Ability

Name the property of real numbers illutstrated below. Be specific w/ the naming. Include "of addition" or of" multiplication if needed.
8(49)= (84)9

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exam Other Question

I need help working out these equations. My teacher made these problems up.
-8+t/3=7

4(x+3)=20

4y+3
_____ =9
7 How do I solve for point C using minimum distance? I don't understand how to go about solving an equation such as A(1,5), B(7,1). Thanks for you help

Scott