Make x the subject of the formula
y = ax

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I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

Zoe placed colored blocks on a scale in science class. each block weighed 0.8 ounces. the total weight of all the colored blocks was 12.8 ounces. how many blocks did zoe place on the scale? write and solve an equation to find the answer.

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.