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IRISSAK [1]
3 years ago
9

At its highest point, the elevation of a country is 5,762 feet above sea level. At its lowest point, the elevation of the countr

y is 8 feet below sea level. Answer parts a through c
Mathematics
1 answer:
GalinKa [24]3 years ago
3 0

Answer:

Step-by-step explanation:

5,762 - (-8)

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Answer:

  54.2 mph

Step-by-step explanation:

Since the drivers leave at the same time and travel in directions 90° from each other, their separation speed can be found using the Pythagorean theorem. Let c represent Cynthia's average speed. Then (c-10) will represent Tim's average speed. Their combined separation speed is 70 miles per hour, so we can write ...

  70² = c² +(c -10)²

  4900 = 2c² -20c +100 . . . . eliminate parentheses

  c² -10c -2400 = 0 . . . . . . . . divide by 2; put in standard form

  (c -5)² -2425 = 0 . . . . . . . . . rearrange to vertex form

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Cynthia's average speed was 54.2 miles per hour.

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2 years ago
−3x + y = 4,<br><br> −9x + 5y = −1<br> find x and y
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Answer:

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