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Likurg_2
2 months ago
6

Show and explain how replacing one equation by the sum of that equation and a multiple of the other produces a system with the s

ame solutions as the one shown. 8x + 7y = 39 4x – 14y = –68
Mathematics
1 answer:
zzz [12.3K]2 months ago
3 0
(1/2, 5)
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Terrence walks at a pace of 2 mi/h to the theater and watches a movie for 2 hours and 15 min he rides a bus back home at 40 mi/h
zzz [12365]

Solution:

Let x be the distance in miles from the house to the theater.

Total time taken for the trip =3.5-2.25=1.25 Hr

Then average speed =\frac{Distance}{Time}= \frac{2x}{1.25}\\

Terrence walks at a speed of 2 miles per hour to the theater and returns home at 40 miles per hour.

Thus, Average Speed =\frac{2+40}{2}= 21\\ mi/hr

Both average speeds must be equivalent. Hence, we can express this as:

\frac{2x}{1.25}=21\\
\\
2x=1.25*21\\
\\
x=13.125\\

Consequently, the distance from home is 13.125 miles.

4 0
2 months ago
Which sentences are punctuated correctly? Select 2 options.
AnnZ [12381]

Answer:

Step-by-step explanation:

Andrew's preferred vegetables include cucumbers, green beans, and red peppers.

Samantha had a wide range of musical tastes; such as jazz, classical, hip hop, country, and heavy metal.

Please correct me if I'm mistaken.

7 0
2 months ago
Read 2 more answers
The most economical proportion for a right circular cone is to have its height three times long as its base diameter. What later
PIT_PIT [12445]

9514 1404 393

Answer:

  ∛(2500π)√37 m² ≈ 120.911 m²

Step-by-step explanation:

If the height of the cone is three times the diameter, that means it is six times the radius. Hence, the volume is computed as...

  V = 1/3πr²h

  V = 1/3πr²(6r) = 2πr³

To find the radius for a volume of 100 m³, solve...

  100 m³ = 2πr³

  r = ∛(50/π) m

To calculate the lateral area, the slant height must be found using the Pythagorean theorem:

  s² = r² +(6r)² = 37r²

  s = r√37

Thus, the lateral area is calculated as...

  LA = πrs

  LA = π(∛(50/π) m)(∛(50/π) m)√37

  LA = ∛(2500π)√37 m² ≈ 120.911 m²

5 0
2 months ago
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