book Maths Puzzle Numerical Ability

8d+6=-2d

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book Other Question

A machine that originally cost $15,600 has a value of $7500at the end of 3 years. The same machine has a value of $2800 at the end of 8 years.

a.) Find the average rate of chang
how would i start out this problem please help me asap!!!
3(x-40)=x + 16
and 4x + 18=2 (441-34x)