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I am Lyosha [343]
3 years ago
14

Susan rode her bike 30 kilometers in 2.5 hour. How fast did she ride her bike in kilometers per hour

Mathematics
2 answers:
dalvyx [7]3 years ago
5 0
The answer is 12. All you had to do was divide. 
So, 30 divided by 2.5 equals 12.
I hope this helps!
Darya [45]3 years ago
5 0
Speed= distance : time
= 30 : 2.5
= 12

answer: 12 km/h
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Step-by-step explanation:

Given that a fair coin is flipped twelve times.

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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}

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