A, b,c is m*m matrix. if symmetric, then tr(abc)=tr(acb). but this does not work if there are 4 symmetric matrix.
give a counter example in the case that there are four symmetric matrices

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step-by-step explanation:

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-8/2y-8=5/y+4-7y+8/y^2-16

we move all terms to the left:

-8/2y-8-(5/y+4-7y+8/y^2-16)=0

we can not solve this equation

30 feet

step-by-step explanation:

that would be 2 1/2 * 12

= 24 + 6

= 30 feet   (answer)