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the formula h-15=3.2t gives the height h in inches of a plant t weeks after planting which is the rate at which plant's height is increasting ?

User Aki K
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now, if we solve for "h", and thus put the equation in slope-intercept form,
\bf h-15=3.2t\implies h=\stackrel{slope}{3.2}t\stackrel{y-intercept}{+15}

notice what the slope is, and recall that the slope of an equation is just the "average rate of change".
User KSev
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