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Elsa wants to save $500 to buy a TV. She saved 18 each week. The amount A (in dollars) that she still needs after w weeks is given by the following function.A(w)=500-18wIf Elsa still needs $194 how many weeks is she been saving?How much money does else’s still need after seven weeks?

Respuesta :

a) We set the given equation to 194, and solve for w:

[tex]\begin{gathered} 194=500-18w,\text{ } \\ 18w=500-194, \\ w=\frac{306}{18}, \\ w=17. \end{gathered}[/tex]

b) If we evaluate the given function at w=7 we get:

[tex]A(7)=500-18\cdot7=374.[/tex]

Answer:

Elsa has been saving for 17 weeks.

After 7 weeks she still has to save $374.

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