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4 years ago

Pleaseee Solve x? - 8x = 20 by completing the square. Which is the solution set of the equation?

Mathematics

1 answer:

gavmur [86]4 years ago

3 0

The correct answer is A. -22,14

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$28,000 invested at a rate of 4% compounded annually; 5 years

sasho [114]

$28 compounded on a Yearly basis over the course of 5 years at a 4% interest rate would be worth:

$34

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3 years ago

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A plane flying horizontally at an altitude of 1 mile and a speed of 510 mi/h passes directly over a radar station. Find the rate

sdas [7]

Answer:

442 miles

Step-by-step explanation:

Given

To properly solve this question, I illustrate some given parameters using attached image

From the image, apply Pythagoras theorem

$x^2 + 1^2 = y^2$

Differentiate w.r.t time (t)

$2x\frac{dx}{dt} + 0 = 2y\frac{dy}{dt}$

$2x\frac{dx}{dt} = 2y\frac{dy}{dt}$

Divide both sides by 2

$x\frac{dx}{dt} = y\frac{dy}{dt}$

From the question, we have that the plan travels are 510mi/h.

This implies that:

$\frac{dx}{dt} = 510mi/h$

So, we then calculate the value of x when the distance (y) is 2mi i.e.:

$y = 2mi$

Apply Pythagoras theorem

$x^2 + 1^2 = y^2$

$x^2 + 1^2 = 2^2$

$x^2 + 1 = 4$

$x^2 = 4-1$

$x^2 = 3$

$x = \sqrt 3$

So, the expression becomes:

$x\frac{dx}{dt} = y\frac{dy}{dt}$

$\sqrt 3 * 510 = 2* \frac{dy}{dt}$

$\frac{\sqrt 3 * 510}{2} = \frac{dy}{dt}$

$\sqrt 3 * 255 = \frac{dy}{dt}$

$\frac{dy}{dt} = 255\sqrt 3$

$\frac{dy}{dt} = 255 * 1.7321$

$\frac{dy}{dt} = 441.655$

$\frac{dy}{dt} = 442$

Hence, the distance is 442 miles

7 0

3 years ago

The best answer gets brainliest

faltersainse [42]

Answer:

ok?

Step-by-step explanation:

Sure friend what do you need help with? I will help you

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3 years ago

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What is the probability of picking a Jack or a Queen?

Rama09 [41]

Answer:

8/52

Step-by-step explanation:

There are 4 Jacks and 4 Queens in a deck of 52 cards, bumping the odds up to 8/52.

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3 years ago

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Can someone please explain the steps (: (: please really need help

Vanyuwa [196]

Answer:

x = 128

Step-by-step explanation:

x and 128 are vertical angles

Vertical angles are equal

x = 128

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3 years ago

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