2 years ago

WILL MARK BRAINLIEST !!!!! ^^

Mathematics

1 answer:

xxMikexx [17]2 years ago

7 0

Answer:

A and D.

Step-by-step explanation:

You have to compare them and the temperature is at 45*.

9/5C - (F + 32).

5/9C = (F + 32).

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Solve by completing the square<br><br>x squared +14x - 51=0

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$x^2 +14x - 51=0\\ \\\Delta = b^{2}-4ac =14^{2}-4*1*(-51)=196+204=400 \\ \\x_{1}=\frac{-b-\sqrt{\Delta }}{2a} =\frac{-14- \sqrt{400}}{2}=\frac{-14-20}{2}= \frac{-34}{2}=-17\\ \\x_{2}=\frac{-b+\sqrt{\Delta }}{2a} =\frac{-14+ \sqrt{400}}{2}=\frac{-14+20}{2}= \frac{6}{2}=3$

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