contestada

a fireplace contains 46 bricks along its bottom row. if each row above decreases by 4 bricks, what is the function that shows the bricks on the 12th row

Respuesta :

[tex]\bf n^{th}\textit{ term of an arithmetic sequence}\\\\ a_n=a_1+(n-1)d\qquad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ d=\textit{common difference}\\ ----------\\ a_1=46\\ d=-4\\ n=12 \end{cases} \\\\\\ a_{12}=46+(12-1)(-4)[/tex]
pabripa2010
in the 12th row there is 138 bricks

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