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horsena [70]
3 years ago
15

A math teacher gave her students two tests. On the first test, 80% of the class passed the test, but only 30% of the class passe

d both tests.
What is the probability that a student passes the second test, given that they passed the first one?
Mathematics
1 answer:
geniusboy [140]3 years ago
6 0

55% because you add 80% and 30% which is 110% and divide that by 2.

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Wanni cycled 6 km from her house to the school at a uniform speed, v km/h. If she increased her speed
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Answer:

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Step-by-step explanation:

Given as :

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Or, t = \dfrac{\textrm 6}{\textrm v}

<u>Now, Again</u>

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So, Time taken = t' = (t - \dfrac{4}{60})hours

i.e t' =  (t - \dfrac{1}{15})hours

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So, (t - \dfrac{1}{15}) = \dfrac{\textrm d}{\textrm v}

Or,  (t - \dfrac{1}{15}) = \dfrac{\textrm 6}{\textrm (v + 2)}

Or , \dfrac{\textrm 6}{\textrm v} -  \dfrac{1}{15} = \dfrac{\textrm 6}{\textrm (v + 2)}

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Or, (90 - v) × (v + 2) = 6 × 15 v

Or, 90 v - 180 - v² - 2 v = 90 v

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v² + 2 v + 180 = 0

Hence The quadratic equation in terms of v is   v² + 2 v + 180 = 0   Answer

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4 years ago
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Answer:

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Step-by-step explanation:

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3 0
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Since we want to know how far apart they are, we need to add them.

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