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1 year ago

Question 12 (5 points)

Mathematics

1 answer:

nikdorinn [45]1 year ago

3 0

Answer:

20%

Step-by-step explanation:

the discount: 285-228=$57

percentage of the discount: 57/285 x 100=20%

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Answer Both Parts and I will give u Brainiest and 20 Points!

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Answer:

2. t=1.5(d)

Step-by-step explanation:

Part A- t=1.5(d)

Part B- 10.5

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a student has a 73% of being let out of class late. if he leaves class late. if he leaves class late, there is a 23% chance that

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Answer:

$\left\{\begin{array}{l}y=-\dfrac{1}{9}x^2 +\dfrac{2}{9}x+\dfrac{89}{9}\\ \\y=\dfrac{1}{8}x^2 -7\end{array}\right.$

Step-by-step explanation:

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Parabola equation:

$y=-\dfrac{1}{9}x^2 +\dfrac{2}{9}x+\dfrac{89}{9}$

2nd boat:

Parabola equation:

$y=ax^2 +bx+c$

The x-coordinate of the vertex:

$x_v=-\dfrac{b}{2a}\Rightarrow -\dfrac{b}{2a}=0\\ \\b=0$

Equation:

$y=ax^2+c$

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Parabola passes through the point (-8,1), so

$1=a\cdot (-8)^2-7\\ \\64a-7=1$

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$a=-\dfrac{1}{8}\\ \\b=0\\ \\c=-7$

Parabola equation:

$y=\dfrac{1}{8}x^2 -7$

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$\left\{\begin{array}{l}y=-\dfrac{1}{9}x^2 +\dfrac{2}{9}x+\dfrac{89}{9}\\ \\y=\dfrac{1}{8}x^2 -7\end{array}\right.$

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