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sweet-ann [11.9K]
3 years ago
6

Gerald graphs the function f(x) = (x – 3)2 – 1. Which statements are true about the graph? Check all that apply. The domain is {

x| x ≥ 3}. The range is {y| y ≥ –1}. The function decreases over the interval (–∞, 3). The function increases over the interval (–1, ∞). The axis of symmetry is x = –1. The vertex is (3, –1).
Mathematics
2 answers:
katrin2010 [14]3 years ago
8 0
Hey! Statement 1 is false because the domain of f is all real numbers since the function is quadratic.

Statement 2 is true.

Statement 3 is true because when we graph f, it is a parabola opening upwards with vertex (3, -1). Since it is opening upward, then the value of x from -∞ to 3 is decreasing while increasing from 3 to ∞.

Statement 4 is false because we just stated above that f is decreasing from -∞ to 3. Hence, f is also decreasing from -1 to 3. Hence, f is not increasing from -1 to ∞.

Statement 5 is false because the axis of symmetry is x = 3.

Statement 6 is true.
Hope this helps! :)

elena-14-01-66 [18.8K]3 years ago
3 0

Answer:

2,3,6 are true on edg

Step-by-step explanation:

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So, your ratio has to represent how many boys to the total number of boys and girls in one classroom, or 13.

 

The proportion becomes, 6 / 13 = x / 78.

 

Cross multiply getting, 13 * x = 6 * 78

 

Divide by 13 to solve for x, or x = 36.

 

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The ratio of boys to girls in all of the classrooms is 36 / 42, or 6 / 7.

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3 years ago
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Trapezoid<br> А<br> B<br> х<br> 130<br> 70<br> y<br> с<br> D<br> X =<br> y =
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Answer:

x=110, y=50

Step-by-step explanation:

Draw a line perpendicular to the base CD from point A. The point of intersection is E. Angle AED=90 degrees. This is a right angle triangle. A triangle has a total angle of 180 degrees. Angle DAE is then 180-(90+70) = 20. The bases of a trapezoid are parallel to each other, making angle EAB a right angle. Add 90 + 20, and you'll get 110 degrees. This is the value of x.

Draw another line perpendicular to the base CD, this time from point B. The point of intersection is F. Angle ABF is 90 degrees. Angle FBC is 130-90=40. Angle BFC is also 90 degrees. You once again find the difference of the numbers from 180. 180-(40+90)=180-130=50. y=50 degrees.

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3 years ago
<img src="https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%3D%20%20%5Cfrac%7B121%7D%7B196%7D%20" id="TexFormula1" title=" {x}^{2}
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x^2=\dfrac{121}{196}\iff x=\pm\sqrt{\dfrac{121}{196}}\\\\x=-\dfrac{\sqrt{121}}{\sqrt{196}}\ \vee\ x=\dfrac{\sqrt{121}}{\sqrt{196}}\\\\\boxed{x=-\dfrac{11}{14}\ \vee\ x=\dfrac{11}{14}}\\\\\sqrt{a}=b\iff b^2=a\\\\\sqrt{121}=11\ \text{because}\ 11^2=121\\\\\sqrt{196}=14\ \text{because}\ 14^2=196

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Step-by-step explanation:

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