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a.A gardener can afford to buy 125 vinca plants and 60 phlox plants. $1.20/plant Vinca $2.50/plant Phlox.The equation in standard form that models the possible combinations of x vinca plants and y phlox plants the gardener can afford to buy is ⇒ $1.20*x + $2.50*yAn equation that models the possible combinations is⇒ $1.20*125 + $2.50*60 = 300Learn more about the gardener plants equation here:https://brainly.com/question/11297629#SPJ1