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prohojiy [21]
3 years ago
10

2x+7y=-20, y=3x+7. solve using elimination

Mathematics
1 answer:
Setler79 [48]3 years ago
8 0

Answer:

(x,y) = (-3,-2)

Step-by-step explanation: Please brainliest!

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amid [387]

Answer:

ok and thank you for point

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3 years ago
Use the formula r=log10^i where r is the measure of the richter scale i is the intensity, to find the richter scale , measuremen
lara [203]
Hi, thank you for posting your question here at Brainly.

Simply substitute the value of the intensity to the variable i. Taking its logarithm to the base 10, the answer would be 7.8. Hence, 6 million ergs is equivalent to 7.8 based on the Richter scale.
3 0
4 years ago
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At the beginning of the school year, 70 students signed up for music lessons. Students could choose drums, guitar, piano, or vio
Irina18 [472]

Answer:

D.

Step-by-step explanation:

1. Answer A:

15 students signed up for violin lessons (4 boys + 11 girls)

15 / 70 = approx. 21% of the class.

Answer A says 28%, so this is incorrect.

2. Answer B:

17 students signed up for drum lessons (11 boys + 6 girls)

17/70 = approx. 24%

B says 17% signed up for drums, so this is incorrect.

3. Answer C.

Wrong because more girls signed up for piano lessons (15 girls, whereas only 9 boys signed up for piano)

4. D. The same percent of boys and girls are taking guitar lessons.

Get the total number of boys and girls in the class (just add the results for each separately for all instruments)

Boys: 11 + 6 + 9 + 4 = 30

Girls: 6+8+15+11 = 40

6 out of 30 boys signed up for guitar

6/30= 20%

8 out of 40 girls signed up for guitar

8/40 = 20%

Answer is D

5 0
3 years ago
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I need help please!!!
svetoff [14.1K]

Answer:

D

Step-by-step explanation:

8 0
3 years ago
He pressure of a tyre is 32 pounds per square inch. Given 1 pound = 0.4536 kilograms 1 inch = 2.54 centimetres Work out the pres
ss7ja [257]

Step-by-step explanation:

1pound =0.4536kiligrams=,453.6grams

1square inch =2.54×2.54=6.4516

(32pounds/inch√2square

×453.6g)

(14515.2g/inch √2

÷6.4516)/6.4516

(2,262.34414)1cm√2

2262g/cm2

7 0
3 years ago
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