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3 years ago

Hi can u plzz help me with these thank you!!!

Mathematics

1 answer:

julsineya [31]3 years ago

4 0

Answer:

$Radius = 5ft$

$Circumference = 31.4\ ft$

$Perimeter = 25.12\ ft$

Step-by-step explanation:

Solving (1):

Given

$Diameter = 10ft$

Required

Determine the radius and circumference

Radius is calculated as follows:

$Radius = \frac{1}{2} * Diameter$

$Radius = \frac{1}{2} * 10ft$

$Radius = 5ft$

The circumference is calculated using:

$Circumference = 2 * \pi * Radius$

$Circumference = 2 * 3.14 * 5ft$

$Circumference = 31.4\ ft$

Solving (2):

Given

$R = 4ft$

Assume that the window is circular, the perimeter is calculated as follows:

$Perimeter = 2 * \pi * R$

$Perimeter = 2 * 3.14 * 4ft$

$Perimeter = 25.12\ ft$

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The graph of a function is a parabola that has a minimum at the point (-3,9). Which equation could represent the function?

Scilla [17]

Answer:

$g(x)=2(x+3)^2+9$ , which corresponds to answer D.

Step-by-step explanation:

Recall that the maximum or minimum of a parabola is always located at its vertex. Notice that all quadratic functions listed are given in what is called "vertex" form, since they explicitly show the vertex coordinates in their formulation:

$f(x)=a(x-x_v)^2+y_v$ where $x_v$ , and $y_v$ stand for the x and y coordinates respectively of the vertex.

Examining all four options, we notice that in all four cases listed, the $y_v$ is correct (equal to positive 9), so we proceed to examine what the $(x-x_v)^2$ expression should look like for $x_v=-3$ :

Notice that when replace $x_v$ with "-3", we end up with a sign change:

$(x-x_v)^2\\(x-(-3))^2=(x+3)^2$

Therefore we find that the last two options can be candidates. Then we recall that the question also states that this should be a minimum. Then, for a parabola to have a minimum, its branches must go upwards, and this corresponds to a case in which the factor $a$ (leading coefficient) multiplying (x-x_v)^2 is positive. So in looking for such condition, we find that the very last option is the only one that verifies such.