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3 years ago

Please help me answer this question????

Mathematics

1 answer:

Alchen [17]3 years ago

7 0

Elimination method means you're essentially. "subtracting" one equation from another.

x-y=17

- x+y=-1

---------

-2y=18

Now we'll solve x+y=-1 and -2y=18 separately.

-2y=18

Divide both sides by -2.

y=-9

x-9=-1

Add 9 to both sides.

x=8

The solutions are x=8 and y=-9, or (8,-9).

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Number 13. Multiply please.

Dafna11 [192]

$(x-y)^2 \\\\\\= (x-y)(x-y)\\\\= x * x + (x)(-y)+(-y)(x) +(-y)(-y)\\\\ = x^2 -xy-xy + y^2\\\\=x^2-2xy + y^2$

Hope that helps!

8 0

1 year ago

Do men’s voting preferences differ significantly from women’s voting preferences?"" Use a level of significance of α = 0.05. Whi

baherus [9]

Answer:

H₀: The voting preference of men and women are not different.

Hₐ: The voting preference of men and women are not different.

Step-by-step explanation:

A hypothesis test for two proportions can be used to determine whether the preference of men differ from women in case of voting.

A Chi-square test contingency table can be used to perform the test.

The hypothesis can be defined as:

H₀: The voting preference of men and women are not different.

Hₐ: The voting preference of men and women are not different.

The test statistic is:

$\chi^{2}=\frac{Row\ total\times Column\ total}{N}$

Decision rule:

If the p-value of the Chi-square test statistic is less than the significance level α = 0.05 then the null hypothesis will be rejected. And if the p-value is more than the significance level then the null hypothesis will not be rejected.

8 0

2 years ago

If the United States is approximately 3.8 x 10 square miles and France is approximately 2.1x10' square

svetoff [14.1K]

Answer:

1.7 x 10 square miles

Step-by-step explanation:

subtract the numbers

6 0

3 years ago

Of the 27 players trying out for the school basketball team, 8 are more than 6 feet tall and 7 have good aim. What is the probab

Komok [63]

Of the 27 players trying out for the school basketball team, 8 are more than 6 feet tall and 7 have good aim. What is the probability that the coach would randomly pick a player over 6 feet tall or a player with a good aim? Assume that no players over 6 feet tall have good aim. A. 7/15 B. 6/15 C. 7/9 D. 5/9

The Answer Is

--------5/9--------

5 0

3 years ago

Is 4/2 + 5/2 a rational or irrational number

sesenic [268]

As both 4/2 and 5/2 are rational Numbers and Sum of rationals is a Rational Number.
Therefore, 9/2 is a Rational Number.

6 0

2 years ago

Read 2 more answers