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Vesnalui [34]
3 years ago
9

Danielle wanted to purchase a blouse with the $100 she received on her birthday. She already spent $37 on CDs. The blouse she wa

nts costs $53. Which operation would she use to make sure she had enough money to buy the blouse? A) add B) subtract C) multiply D) divide
Mathematics
1 answer:
ZanzabumX [31]3 years ago
6 0

Answer:

B)subtract

Step-by-step explanation:

Danielle would have to use the subtract operation to find out if she had enough money to buy the blouse after buying the CDs.

It would turn out like this:

$100 - $37 = $63

Now since Danielle knows that she has $63 dollars left, she has more than enough to buy the $53 blouse.

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The answer is C because it’s the only answer that could be correct.
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f(x) = square root ( x^4 -16x^2) let f be the function given by: . . a) Find the domain of f.. b) Find f '(x). c) Find the slope
Bond [772]
A ) The domain:
x^{4} -16 x^{2}  \geq 0 \\  x^{2} ( x^{2} -16) \geq 0 \\  x^{2} -16 \geq 0 \\  x^{2}  \geq 16
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b ) f ` ( x ) = \frac{1}{2 \sqrt{ x^{4} -16 x^{2} } } *( 4 x^{3} - 32 x ) = \\ = \frac{2x( x^{2} -8)}{ \sqrt{ x^{4}-16 x^{2}  } }
c ) The slope of the line normal to the graph at x = 5
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8 0
3 years ago
A fair coin is continually flipped until heads appears for the 10th time. Let X denote the number of tails that occur. Compute t
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Answer:

The probability mass function is expressed as:

P(x) = [(x+r-1)C(r-1)]*[p^r]*[(1-p)^x]

Step-by-step explanation:

This is not a binomial distribution. It is actually a negative binomial distribution. The probability mass function is expressed below:

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where:

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r-1 = number of successes (10 in this scenario)

p = probability of a success

nCr = n!/[r!(n-r)!]

The main formula difference in the positive binomial versus negative binomial is this: With respect to the negative binomial, it is obviously  known that the last event will be: when we reach our 10th "head", we stop .

Thus, the last flip will ALWAYS be a "head".

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