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cricket20 [7]
3 years ago
14

the cost of a cell phone varies directly with the number of minutes it uses.if it costs $73.25 to talk for 180 minutes , what is

the cost to talk for 320 minutes?
Mathematics
2 answers:
I am Lyosha [343]3 years ago
7 0

Answer:

$128

Step-by-step explanation:

73.25/180 = 7325/18000 = 0.4

0.4 * 320 = 128

Hope this helps!      :3

plz mark as brainliest!

Vladimir79 [104]3 years ago
4 0

Answer:I believe 786.34

Step-by-step explanation:

You divide 180 by 73.25 which is 2.46, then multiply this number by your 320 minutes to get the answer

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Answer: After 7 years the number of birds of species A and B are same. and the number of birds during that year will be 140.


Step-by-step explanation:

Given: Sharon is conducting research on two species of birds at a bird sanctuary.

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S=2^x+12

The number of birds of species B is represented by the equation below,where S represents the number of birds, x years after beginning her research.

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To plot the above function, first find points by which they are passing.

For species A, At x=0 , S=1+12=13

At x=2 , S=2+12=14

Similarly find more points and plot curve on graph.

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Now, from the graph the intersection of curve (for A) and line (for B) is at (7,140) which tells that After 7 years the number of birds of species A and B are same. and the number of birds during that year will be 140.



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