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astra-53 [7]
3 years ago
9

Proport

Mathematics
2 answers:
larisa [96]3 years ago
6 0

Answer:

5.25, 5/14, or 21/4 hours

Step-by-step explanation:

400        700

------  =    ------

 3             x

Gwar [14]3 years ago
4 0
It takes 5 minutes per square foot (400/180=5) and so 5 minutes per square for 720 squares: 720x5=3,600. 3,600 minutes is equivalent to 60 hours so it takes him 60 hours.
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nordsb [41]

Answer: it is 1.8

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7 0
2 years ago
Phil is 2 years older than Andrew. Andrew is 6 years old. The sum of their ages is 22 years. How old is Bob?
KatRina [158]

Answer:

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Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
A fair coin is flipped twelve times. What is the probability of the coin landing tails up exactly nine times?
seraphim [82]

Answer:

P\left(E\right)=\frac{55}{1024}

Step-by-step explanation:

Given that a fair coin is flipped twelve times.

It means the number of possible sequences of heads and tails would be:

2¹² = 4096

We can determine the number of ways that such a sequence could contain exactly 9 tails is the number of ways of choosing 9 out of 12, using the formula

nCr=\frac{n!}{r!\left(n-r\right)!}

Plug in n = 12 and r = 9

       =\frac{12!}{9!\left(12-9\right)!}

       =\frac{12!}{9!\cdot \:3!}

       =\frac{12\cdot \:11\cdot \:10}{3!}            ∵ \frac{12!}{9!}=12\cdot \:11\cdot \:10

       =\frac{1320}{6}                   ∵ 3!\:=\:3\times 2\times 1=6

       =220

Thus, the probability will be:

P\left(E\right)=\frac{n\left(E\right)}{n\left(S\right)}

         =\frac{220}{4096}

         =\frac{55}{1024}

Thus, the probability of the coin landing tails up exactly nine times will be:

P\left(E\right)=\frac{55}{1024}

4 0
3 years ago
PLEASE HELP ME IF YOU CAN! please tell me how you got the answer thank you!
Temka [501]
3sqrt(2)

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3 0
2 years ago
What is the range of the function f(x) = 3x - 5, for the domain { -1, 2, 4}
morpeh [17]
Hope this helps!! Solved it step by step:)

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