abelxoconda
12.02.2021 •
Mathematics
a local clothing store gives a discount of $15 off any purchase of $50 or more in the month of august. this can be represented by the function f(x) = x - 15. this same store gives a 15% discount to teachers on the third week of every month. this can be represented by the function g(x) = 0.85x. reed is a teacher and decides to shop at this store im the third week of august. select all of the following that could be used to calculate what reed will pay that day is he spends $50 or more. a. 0.85x - 15 b. 0.85(x - 15) c. 42.50(x - 15) d. 0.15x - 15 e. 0.15(x - 15) f. 0.85x - 12.75
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Ответ:
Vertex form of a quadratic is y = a(x - h)^2 + k.
( h , k ) is the vertex and in the problem the very is ( 1, -3) so plug that in and:
y = (x - 1 )^2 + (-3) this is equal to:
y = (x -1)^ 2 - 3
hope this helps c: