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ElenaW [278]
3 years ago
6

Find the foci for the ellipse given by the equation: 9x^2 + 25y^2 = 225

Mathematics
1 answer:
Tju [1.3M]3 years ago
5 0

It’s B. (4,0) and (-4,0)

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1,352÷{[(81×7)-12]×6} solve?
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Help me out on this question
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the third one

Step-by-step explanation:

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Out of a group of 120 students that were surveyed about water sports, 28 said they ski and 52 said they wake
podryga [215]

Answer:

10% of the students ski and do not wake board

Step-by-step explanation:

The total number of students is 120. 28 students ski while 52 students wake board. 16 of the students ski and wake board.

Let S represent students who ski and W represent those who wake board also W' represent those who do not wake board.

Therefore:

S = 28

W = 52

n = total number of student = 120

S ∩ W = those who ski and wake board = 16

Those who ski and do not wake board = S ∩ W' = S - (S ∩ W) = 28 - 16 = 12

Probability of those who ski and do not wake board = (S ∩ W') / n = 12 / 120 = 0.1 = 10%

10% of the students ski and do not wake board

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3 years ago
What is the unit rate for 247 heartbeats in 612 minutes
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247/612

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247 heart beats / 612 minutes

beats/ minutes

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