The sale price S (in dollars) of an item is given by the formula S=L-rL , where L is the list price (in dollars) and r is the discount rate (in decimal form). $18 sale price $30 list price

step-by-step explanation:

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if she was to only spend a dollar she can get 1lb

step-by-step explanation:

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step-by-step explanation:

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)