jeovontamarley

20.04.2020 • 

Mathematics

Jamie can work no more than 20 hours a week this summer. She needs to earn at least $256 a week to save enough for a car before school starts. She makes $6 an hour babysitting and $16 an hour cleaning houses. Graph the system of inequalities that models the situation. Let x be equal to hours spent babysitting and y be equal to hours spent cleaning houses. Excluding the boundaries, place a point inside the region of the graph that satisfies the system.

Ответ:

leo4687

27.09.2021

Mathematics

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x^2 - 12x + 37

x^2 + 16

x^2 + 6x + 34

Step-by-step explanation:

Let's expand the first one:-

(x - 6 + i)(x - 6 - i)

= x^2 - 6x - ix - 6x + 36 + 6i  + ix - 6i - i^2

= x^2 - 12x  -ix + ix - 6i + 6i  + 36 - (-1)

= x^2 - 12x + 37 (answer).

(x + 4i)(x - 4i)

= x^2 + 4ix - 4ix -16 i^2

= x^2 + 16   (answer).

(x + 3 + 5i)(x + 3 - 5i)

= x^2 + 3x - 5ix + 3x + 9 - 15i + 5ix  + 15i - 25 i^2

= x^2 + 6x + 34. (answer).

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