3 years ago

on a tv game show,omar needs answer 7 out of every 10 questions correctly. There will be 30 questions in all

Mathematics

1 answer:

shtirl [24]3 years ago

8 0

He Has To Get 21/30 Questions Right, Or 0.7%(70%) Right.

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Which of the following are true?

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3 years ago

Help please! 6x^2+2x-9=0 A 6.4, -8.4 B 1.1, -1.4 C -2.2, 2.8 D -1.1, -1.4

Yakvenalex [24]

$6x^2+2x-9=0\\\\a=6;\ b=2;\ c=-9\\\\\Delta=b^2-4ac\to\Delta=2^2-4\cdot6\cdot(-9)=220\\\\x_1=\dfrac{-b-\sqrt\Delta}{2a};\ x_2=\dfrac{-b+\sqrt\Delta}{2a}\\\\x_1=\dfrac{-2-\sqrt{220}}{2\cdot6}=\dfrac{-2-\sqrt{220}}{12}\approx-1.4\\\\x_2=\dfrac{-2+\sqrt{220}}{2\cdot6}=\dfrac{-2+\sqrt{220}}{12}\approx1.1$

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Step-by-step explanation:

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3 years ago

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650/550

=1 100/550

1 2/11

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