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3 years ago

Find the standard form of the equation of the parabola with a focus at (-7, 0) and a directrix at x = 7.

Mathematics

2 answers:

Volgvan3 years ago

8 0

x = 1/(4p)*y^2

x = 1/(4*-7)*y^2

x = -1/28*y^2

34kurt3 years ago

5 0

Answer:

y^2 = -28x.

Step-by-step explanation:

The general form for this type of parabola is y^2 = 4ax where the focus is at (a,0) and the directrix is x = -a.

So substituting we get

y^2 = 4 * -7 * x

y^2 = -28x

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Svetlanka [38]

Step-by-step explanation:

first do the triangle : 11 times 6 divided by 2 equals

the formula for a triangle is base times height divided by 2

now multiply 33 x 2 = 66because there is another triangle at the back.

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do 48 x 2 because there are 2 sides

now do the base : 11x8 = 88

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202

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2 years ago

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sleet_krkn [62]

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4 0

3 years ago

Read 2 more answers

A wire that is 22 feet long connects the top of a pole to the ground. The wire is attached to the ground at a point that is 10 f

krok68 [10]

✰ Concept Used :-

⠀

In this question, we can clearly observer that the diagram shows a right angled triangle. And, we have been provided with the value of base, and the value of hypotenuse, using the pythagoras theorem, now we can easily find out the value of the perpendicular i.e. the value of the side h. According to the pythagoras theorem, square of hypotenuse is equal to the sum of square of perpendicular and square of side respectively. Therefore, square of side is equal to the difference of square of hypotenuse and square of perpendicular.

⠀

✰ Given Information :-

⠀

Hypotenuse = 22 ft.
Base = 10 ft.

⠀

✰ To Find :-

⠀

The value of side or the perpendicular

⠀

✰ Formula Used :-

⠀

$\star \: \underline{ \boxed{ \purple { \sf {Side}^{2} = {Hypotenuse}^{2} - {Base}^{2} }}} \: \star$

⠀

✰ Solution :-

⠀

$\sf \longrightarrow {Side}^{2} = {(22 \: ft)}^{2} - {(10 \: ft)}^{2} \: \: \: \\ \\ \\ \sf \longrightarrow {Side}^{2} = {484 \: ft}^{2} - {100 \: ft}^{2} \: \: \: \: \: \: \\ \\ \\ \sf \longrightarrow {Side}^{2} = {384 \: ft}^{2} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \\ \sf \longrightarrow {Side}^{} = \sqrt{ {384 \: ft}^{2} } \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \\ \sf \longrightarrow {Side}^{} = \underline{ \boxed{ \frak{ \green{19.60 \: ft}}}} \: \star \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\$

Thus, option B. 19.60 ft. is the correct option.

⠀

$\underline{\rule{230pt}{2pt}} \\ \\$

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2 years ago

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Darya [45]

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2 years ago

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elena-14-01-66 [18.8K]

Answer:

all we know is he has $1,110 in tens because you dont give me how many twenty dollar bills

Step-by-step explanation:

111*10=1110

7 0

3 years ago