2 years ago

At noon, a tank contained 10 in. of water. After several hours, it contained 7 in. of water. What is the

Mathematics

1 answer:

Olin [163]2 years ago

5 0

-30% answer is right because it lost 3 inches and 30 percent of 10 is 3.

Answer: -30%

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What are the zeros of the quadratic function? y = x^2 - 2x - 15

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Answer:

$x=\frac{1+\sqrt{31}}{2},\:x=\frac{1-\sqrt{31}}{2}$

Step-by-step explanation:

$-> 0=2x^2-2x-15$

-zeros means the solution aka x intercept, meaning y=0

$x_{1,\:2}=\frac{-\left(-2\right)\pm \sqrt{\left(-2\right)^2-4\cdot \:2\left(-15\right)}}{2\cdot \:2}$

=> according to quadratic formula

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=> $x_{1,\:2}=\frac{-\left(-2\right)\pm \:2\sqrt{31}}{2\cdot \:2}$

simplify

$x_1=\frac{-\left(-2\right)+2\sqrt{31}}{2\cdot \:2},\:x_2=\frac{-\left(-2\right)-2\sqrt{31}}{2\cdot \:2}$

$x=\frac{1+\sqrt{31}}{2},\:x=\frac{1-\sqrt{31}}{2}$

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Problem page debra finished her chemistry assignment in 15 hours. then she completed her history assignment in 34 hours. what wa

Maurinko [17]

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3 years ago

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