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BigorU [14]
3 years ago
11

Please help me, I need help I don’t know what to do. Last question.

Mathematics
2 answers:
Marina86 [1]3 years ago
8 0
The complete answer is 5/21
Phantasy [73]3 years ago
4 0

Answer:

B. 5/21 chance

Step-by-step explanation:

The probability he gets the black marker first is 5/7. The probability he gets a blue marker after his black marker not replaced is 2/6 or 1/3. 1/3*5/7 is 5/21

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The graphs of the equation y = 4x + 1 and y - kx = 10 are perpendicular when k = _______?
Ann [662]

Answer:

k=-\frac{1}{4}

Step-by-step explanation:

we have

Line 1

y=4x+1

Equation in slope intercept form

The slope is equal to

m_1=4

Line 2

y-kx=10

y=kx+10

Equation in slope intercept form

The slope is equal to

m_2=k

we know that

If two lines are perpendicular, then their slopes are opposite reciprocal (the product of the slopes is equal to -1)

so

m_1*m_2=-1

substitute

(4)(k)=-1

k=-\frac{1}{4}

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The water level in an ocean bay changes at an average rate of 3 meters per hour. At this rate,how many hours would it take for t
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In this big ol' word problem, this is just an instance of basic multiplication/division.

If it takes it 1 hour for 3 meters...

12 ÷ 3 = 4.

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3 0
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