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lorasvet [3.4K]
3 years ago
14

Can someone please help ? Thank you

Mathematics
2 answers:
Dennis_Churaev [7]3 years ago
5 0
A) after 40 mins plan A costs $4 and plan B costs $8, so plan A costs less, by $4

b) at 140 mins the plans cost the same. If the time spent is less than 140 mins plan A would cost less

So basically answers are:
Plan A
$4
140
Plan A
Schach [20]3 years ago
3 0

I am not sure but I think Plan B is less. In my opinion.

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Step-by-step explanation:The solution is x > 3

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Read 2 more answers
How do you find a unit vector that is orthogonal to both u = (1, 0, 1) v = (0, 1, 1)?
inna [77]

Answer:

one unit vector is ur=(-1/√3 ,1/√3 ,1/√3 )

Step-by-step explanation:

first we need to find a vector that is ortogonal to u and v . This vector r can be generated through the vectorial product of u and v , u X v :r=u X v =\left[\begin{array}{ccc}i&j&k\\1&0&1\\0&1&1\end{array}\right] = \left[\begin{array}{ccc}0&1\\1&1\end{array}\right]*i +  \left[\begin{array}{ccc}1&0\\1&1\end{array}\right]*j + \left[\begin{array}{ccc}1&0\\0&1\end{array}\right]*k = -1 * i + 1*j + 1*k = (-1,1,1)

then the unit vector ur can be found through r and its modulus |r| :

ur=r/|r| = 1/[√[(-1)²+(1)²+(1)²]] * (-1,1,1)/√3 =(-1/√3 ,1/√3 ,1/√3 )

ur=(-1/√3 ,1/√3 ,1/√3 )

7 0
4 years ago
Someone pls help me :((((
Vanyuwa [196]

9.2  this is because

∠ A = tan^-1 ( 5 /12 )

∠ B = tan^ − 1 ( 12/ 5 )

4 0
4 years ago
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