3 years ago

I AM GIVING OUT BRAINIIEST

Mathematics

1 answer:

777dan777 [17]3 years ago

5 0

Answer:

First Question - c. 320

Second Question - b. 5

Third Question - a. 8

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Solve the system using elimination.

expeople1 [14]

Answer:

(- 9, - 9)

Step-by-step explanation:

Given the 2 equations

3x - 4y = 9 → (1)

- 3x + 2y = 9 → (2)

Adding (1) and (2) will eliminate the term in x

(1) + (2) term by term

(3x - 3x) + (- 4y + 2y) = (9 + 9)

0 - 2y = 18

- 2y = 18 ( divide both sides by - 2 )

y = - 9

Substitute y = - 9 into (1) or (2) and evaluate for x

(1) → 3x + 36 = 9 ( subtract 36 from both sides )

3x = - 27 ( divide both sides by 3 )

x = - 9

Solution is (- 9, - 9)

3 0

4 years ago

For a random sample of 50 measurements on the breaking strength of cotton threads, the mean breaking strength was found to be 21

Vikentia [17]

Answer:

205.81 to 214.19

Step-by-step explanation:

Sample size (n) = 50

Sample mean weight (X) = 210 grams

Sample standard deviation (s) = 18 grams

Confidence coefficient (Z) at 90% = 1.645

The confidence interval for the true mean breaking strength of cotton threads of this type, at a 90% confidence level, is given by:

$CI=X \pm Z*\frac{s}{\sqrt n}\\CI=210 \pm 1.645*\frac{18}{\sqrt 50}\\CI = 210 \pm 4.19\\CI =205.81\ to\ 214.19$

The confidence interval is 205.81 grams to 214.19 grams.

6 0

4 years ago

What’s the correct answer for this?

STatiana [176]

Answer:

6.7

Step-by-step explanation:

8 0

3 years ago

I’m taking a test

Elodia [21]

Rip banned account lol

5 0

3 years ago

I WILL GIVE BRAINLIEST AND 100 POINTS!! NEED NUMBER 11 (ignore all writing

madreJ [45]

-2-(-12) the total is 10

4 0

3 years ago