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2 years ago

Can i have help with this please

Mathematics

2 answers:

vredina [299]2 years ago

7 0

Answer: Heyaa! ~

Your Answer is... 7r²− r −1, Which is B.

Step-by-step explanation:

Subtract the numbers, And then combine like terms,

Solution: 7r²− r −1

Hopefully this helps you! ^

Evgen [1.6K]2 years ago

3 0

Answer:

B) 7r² - r -1

Step-by-step explanation:

(3r² + 7r + 1) + (4r² - 8r - 2)

1. Remove unnecessary parentheses

3r² + 7r + 1 + 4r² - 8r - 2

2. Combine like terms (ex: r and -2r, n and 4n)

7r² - r -1

Therefore, the correct answer is B.

Hope this helps!

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1. What is the marginal distribution of individuals who are underweight?

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3 years ago

Read 2 more answers

Assume that 200 babies are born to 200 couples treated with the XSORT method of gender selection that is claimed to make girls m

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Answer:

a) test statistic = 2.12

b) p-value = 0.017

c) we reject the Null hypothesis

Step-by-step explanation:

Given data :

N = 200

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p = x / n = 115 / 200 = 0.575

significance level ( ∝ ) = 0.1

aim : test whether the proportion of girls births after the treatment is greater than 50% that occurs without any treatment .

A) Determine the test statistic

H0 : p = 0.5

Ha : p > 0.5

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Z - test statistic = ( 0.575 - 0.5) / $\sqrt{0.5*0.5 / 200}$ = 2.12

b) determine the p-value

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3 years ago

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Answer:

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4 years ago

Delaware was the first state to enter the Union and Hawaii was the 50th. If we order the positions of entry for the rest of the

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Answer:

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Step-by-step explanation:

Let's call x to the order-of-entry of State B, therefore the order-of-entry of State A is x+1. Given that he product of their order-of-entry numbers is 132:

x*(x+1) = 132

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Using quadratic formula:

$x = \frac{-b \pm \sqrt{b^2 -4(a)(c)}}{2(a)}$

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3 years ago