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3 years ago

1. x² + 2xy – 7 xy + 4y?Input your answer here:

Mathematics

1 answer:

viktelen [127]3 years ago

6 0

collect the like terms:

Solution: x^2-5xy+4y

P.S

get the photo math app. :)

Hope that helps.

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Use the quadratic formula to determine the roots of the equation y= 2x^2 + 2x -7

satela [25.4K]

Answer:

1.436 or this=−2.436

Step-by-step explanation:

6 0

3 years ago

A circular region has a population of about 15,500 people and a population density of about 775 people per square kilometer. Fin

Reil [10]

Answer:

2.5 km

Step-by-step explanation:

First, find the area of the region:

A circular region has a population of about 15,500 people;
A population density of about 775 people per square kilometer.

So, there are $15,500 :775=20$ square kilometers.

Now, let x kilometers be the radius of the circular region, then

$A_{\text{circilar region}}=\pi r^2\\ \\20=\pi r^2\\ \\r^2=\dfrac{20}{\pi}\approx 6.366198\\ \\r=\sqrt{3.366198}\approx 2.523$

To the nearest tenth this is 2.5 km.

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3 years ago

22. Abnormalities In the 1980s, it was generally believed that congenital abnormalities affected about 5% of the nation’s childr

Vinvika [58]

Answer:

Step-by-step explanation:

Set up null and alternate hypothesis

H0: p =0.05

Ha: p>0.05

(One tailed test at 5% level)

Sample size n =384

Sample proportion p = 46/384 =0.1198

p difference = 0.1198-0.05 =0.0698

Std error = $\sqrt{\frac{0.1198*0.8702}{384} } =0.0165$

Test statistic = 4.23

p value = 0.000012

Since p<0.05, we reject null hypothesis

There is more than 99.95% probability that proportion is more than 0.05

We accept the claim that the risk has increased.

6 0

3 years ago

Round 5294 to the nearest hundred

pochemuha

5294 => 5300

294 is nearest to 300

8 0

3 years ago

Read 2 more answers

Four is no less than the quotient of a number x and 2.1

kompoz [17]

Since quotient is dividing, 4 is greater than or equal to x/2.1 and 4≥x/2.1. Multiplying both sides by 2.1, we get 8.4 ≥x

8 0

3 years ago

1. x² + 2xy – 7 xy + 4y?Input your answer here:​

1. x² + 2xy – 7 xy + 4y?Input your answer here: