Answer:
First option.
Step-by-step explanation:
Use the formula y = mx + b.
Where m is the slope, and b is the y-intercept.
y = -2x + 3
The slope is -2. The y-intercept is (0, 3).
The most appropriate choice for similarity of triangles will be given by -
Speed of tip of the shadow of woman = 6 ft/s
What are similar triangles?
Two triangles are said to be similar, if the corrosponding angles of the triangles are same and the corrosponding sides of the triangles are in the same ratio.
Here,
The diagram has been attached here
Let the distance of woman from the pole be x ft and the distance of tip of the shadow to the pole be y ft.
Height of street light = 18 ft
Height of woman = 6ft
The two triangles are similar [As height of woman is parallel to the height of pole]
![\frac{y - x}{6}=\frac{y}{18}\\18y - 18x = 6y\\18y - 6y = 18x\\12y = 18x\\y = \frac{18}{12}x\\y = \frac{3}{2}x\\](https://tex.z-dn.net/?f=%5Cfrac%7By%20-%20x%7D%7B6%7D%3D%5Cfrac%7By%7D%7B18%7D%5C%5C18y%20-%2018x%20%3D%206y%5C%5C18y%20-%206y%20%3D%2018x%5C%5C12y%20%3D%2018x%5C%5Cy%20%3D%20%5Cfrac%7B18%7D%7B12%7Dx%5C%5Cy%20%3D%20%5Cfrac%7B3%7D%7B2%7Dx%5C%5C)
To find the speed, we have to differentiate both sides with respect to time 't'
![\frac{dy}{dt} =\frac{3}{2}\frac{dx}{dt}\\\frac{dy}{dt}=\frac{3}{2} \times 4\\\frac{dy}{dt} = 6](https://tex.z-dn.net/?f=%5Cfrac%7Bdy%7D%7Bdt%7D%20%3D%5Cfrac%7B3%7D%7B2%7D%5Cfrac%7Bdx%7D%7Bdt%7D%5C%5C%5Cfrac%7Bdy%7D%7Bdt%7D%3D%5Cfrac%7B3%7D%7B2%7D%20%5Ctimes%204%5C%5C%5Cfrac%7Bdy%7D%7Bdt%7D%20%3D%206)
Speed of tip of her shadow = 6 ft
To learn more about similarity of triangles, refer to the link-
brainly.com/question/14285697
#SPJ4
Answer:
Step-by-step explanation:
If the radius of a circle is doubled, the area of the circle will be quadrupled and the circumference will also be doubled. This makes sense because the area of a circle is directly proportional to the square of the radius of the circle (if the radius of a circle is increased x times, its area will be increased to x^2 times the original area), whereas the circumference is proportional to the size of the radius (if the radius of a circle is increased x times, its circumference will increase x times).
<span>f(x)=5x+3/6x+7
This means that f(6/x) = [</span>5(6/x)+3] / [6(6/x)+7] = [ 30/x +3 ] / [36/x +7]
If we assume x≠0 , f(6/x) = [30 +3x]/ [36 + 7x]
g(x)=√<span> [ x^2-4x ]
</span>
g(x-4) = √ [ (x-4)^2-4(x-4) ] = √ [ x² -8x +16 -4x +16 ] = √ [ x^2-12x +32]