Angel's Door Dash order was $28.00.

Mathematics

2 answers:

grin007 [14]2 years ago

4 0

Answer: 23.80

Step-by-step explanation:

IRINA_888 [86]2 years ago

4 0

Answer:

4 dollars and 2 cents

Step-by-step explanation:

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Whats the answer to 45=x(14-x)

ElenaW [278]

$45=x(14-x)\\ \\45=14x-x^2\\ \\x^2-14x+45=0\\ \\\Delta = b^{2}-4ac = (-14)^{2}-4*1* 45=196-180=16 \\ \\x_{1}=\frac{-b-\sqrt{\Delta }}{2a} =\frac{14- \sqrt{16}}{2}=\frac{14-4}{2}= \frac{12}{2}=6\\ \\x_{2}=\frac{-b+\sqrt{\Delta }}{2a} =\frac{14+\sqrt{16}}{2}=\frac{14+4}{2}= \frac{18}{2}=9$