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observe as seguintes situações e sua representação em linguagem matematica dois numeros x e y são tais 2x y=6 x-y=3

Answers

Answer 1

Answer:

Answer:

The value of x any y are "-5.29 and 0.79" and "3.79 and -2.29"

Step-by-step explanation:

Given values:

$2xy =6.....(a)\n\nx-y= 3.....(b)\n\n$

After solve equation (a) we get

$\ equation: \n\n2xy= 6\n\nxy =(6)/(2) \n\nxy = 3.....(x)\n\n$

After solve equation (b) we get

$\ equation: \n\nx-y =3\n\nx= 3+y....(x1)\n$

put the value of x in to equation (x)

$(3+y)y = 3\n$

$y^2+3y-3=0\n\n\ compare \ the \ value \ with \ ay^2+by+c=0\na= 1\nb=3\nc=-3\n\ Formula: \ny= (-b\pm√(b^2-4ac))/(2a)\ny= (-3\pm √(9+12))/(2)\ny= (-3\pm √(21))/(2)\n$

The value of y is = -5.29 and 0.79, put the value of y in x1 equation so, we get: 3.79 and -2.29

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A pharmaceutical company ran a clinical trial to test if drug X cures disease Y. A statistician named Z who is taking BIO 211 was given a task to perform a null hypothesis test. The test was perfect, and the null hypothesis was rejected at the alpha = 0.05 significance level. However, unbeknownst to Z, the company ran 39 extra clinical trials and secretly hired Z’s classmates to evaluate data obtained from each independent trial with the same null hypothesis test at the same significance level. a. What is the null hypothesis? Drug X does cure disease Y Drug X does not cure disease Y

Answers

Answer:

The null hypothesis is A) Drug X does cure disease Y

Step-by-step explanation:

Consider the provided information.

If there is no statistical significance in the test then it is know as the null which is denoted by $H_0$ , otherwise it is known as alternative hypothesis which denoted by $H_a$ .

A pharmaceutical company ran a clinical trial to test if drug X cures disease Y.

Since, claim is drug X cures disease.

Therefore, the null hypothesis is A) Drug X does cure disease Y

Valerie wants to take out a discount loan of $569. The rate is 4.5% for 250 days. How much interest will she pay? (Be sure to round the time to the nearest hundredth.

Answers

The interest is computed from

... I = Prt

where P is the principal amount ($569), r is the rate (0.045) and t is the time in years (250/360).

... I = $569×0.045×250/360 ≈ $17.78

Please note that time is not rounded. Rather, the exact value (25/36) is used in the calculation. The only rounding of any number is done at the end, where the amount is rounded to the nearest cent. (Your text authors should know this.)

_____

If you follow the problem instructions (which Valerie's lender will not do), the interest is calculated as ...

... t = 250/360 = 0.6944444... ≈ 0.69 . . . . years

... I = $569×0.045×0.69 ≈ $17.67

_____

Note the rounding of intermediate numbers (time) introduces an error of about $0.11 in the answer.

Answer:$17.41 (A+)

Step-by-step explanation:

What is the perimeter of a square with s = 8 centimeters?

Answers

Answer:

32centimeters

Step-by-step explanation:

4 sides are in a sqaure and all of them are equal so

8 times 4 is 32

Reynaldo rode his bike 2 miles north and 3 miles east. Which equation should he use to find the distance, d, that takes himdirectly back home?
2²+3² - of
3²-2²-2
of +2² - 3²
2 + 3²= 2²
Answer

Answers

Answer:

I would say it would be D

Step-by-step explanation:

Answer:the answer is d hope this helped

Step-by-step explanation:

I WILL MARK BRAINLIST
help ASAP and please answer both questions asked

Answers

Answer:

1. 768 square yards

2. 384 square yards

Step-by-step explanation:

1. 16 x 16 = 256

256 x 3 = 768 square yards

2. 16 x 16 = 256

256/2 = 128

128 x 3 = 384 square yards

Please show you're work! THANKS! Need help asap

Answers

9514 1404 393

Answer:

2a. (x, y) = (2, 2)

2b. (x, y) = (3, -1)

3. -5, 3, y, 5, 1

Step-by-step explanation:

2A.

The first equation defines an expression for x, so it is convenient to use that to substitute for x in the second equation.

2(3y-4) -y = 2 . . . . . substitute for x

6y -8 -y = 2 . . . . . . eliminate parentheses

5y = 10 . . . . . . . . . add 8, collect terms

y = 2 . . . . . . . . . . divide by 5

x = 3(2) -4 = 2 . . . find x using the first equation

The solution is (x, y) = (2, 2).

2B.

Add 3 times the second equation to the first.

(3x +2y) +3(-x +y) = (7) +3(-4)

5y = -5 . . . . . simplify

y = -1 . . . . . . . divide by 5

x = y +4 = -1 +4 = 3 . . . . rearrange the second equation

The solution is (x, y) = (3, -1).

3.

The slope of this equation is -5 [the x-coefficient]. I would start at +3 [the y-intercept] on the y axis and then drop down 5 and run over 1 .

[The slope is the ratio of rise to run. A slope of -5 means the "rise" is a drop of 5 for each "run" of 1 unit to the right.]

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