326=12m+6c+x The reason your x does not have a number is because it is unknown so in order to solve for x you need to get rid of the 12m+6c so in order to that you can divide it on both sides so you would get 326/12m+6c=x the divide your numbers 18.1=x but you cant have a tenth of a djembe drum so you would have to round up to 19.
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The second and the fourth
Coral reefs<span> begin to </span>form<span> when free-swimming </span>coral<span> larvae attach to submerged rocks or other hard surfaces along the edges of islands or continents. As the </span>corals grow<span> and expand, </span>reefs<span> take on one of three major characteristic structures —fringing, barrier or atoll.</span>