exam Maths Puzzle Numerical Ability

please help me solve this equation
Find the LCM
5(z-3)and 15(z-3)

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exam Other Question

I need help with a question that says: solve each of the following for x
*1/8=4^(6x+2)
*(1/4)^x=256
*log10x=4 what is the end behavior type and end behavior model of the function f(x)= x^3-4x^8-7x^5+6?