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Rus_ich [418]
3 years ago
9

Which of the following parabolas opens upward and appears narrower than y = −3x^2 + 2x − 1? A. y = 4x^2 − 2x − 1 B. y = −4x^2 +

2x − 1 C. y = x^2 + 4x D. y = −2x^2 + x + 3
Mathematics
1 answer:
Kamila [148]3 years ago
7 0
Narrowing it down it's either a or c because the other 2 choices open downward (negative a).
Graphing the 2 parabolas choice c is narrower.
c
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The speed of the boat going with a current is 20 mph. When the boat goes against the current, the speed is 16 mph. Find the spee
adoni [48]

Answer:

The speed of the boat in still water is 18 mph.

The speed of the current is 2 mph

Step-by-step explanation:

Let x represent the speed of the boat in still water.

Let y represent the speed of the current.

When the boat goes against the current, the speed is 16 mph. Assuming it traveled against the current while going upstream, its total speed would be (x - y) mph. It means that

x - y = 16  (equation 1)

Going downstream, the boat averages 20 mph. Assuming it traveled with the current, its total speed would be (x + y) mph. It means that

x + y = 20  (equation 2)

Adding both equations, it becomes

2x = 36

x = 36/2

x = 18 mph

Substituting x = 18 into equation 1, it becomes

18 - y = 16

y = 18 - 16

y = 2 mph

4 0
2 years ago
The distance around a circle is also called the circumference. The diameter of a circle is the distance across the circle throug
Vika [28.1K]

Answer:

True

Step-by-step explanation:

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6 0
3 years ago
Multiply. The question is in the picture.
Burka [1]

15a^3b^4c^5----> answer B

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now just add  

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7 0
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Covert each into algebraic equations
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Answer:

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