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Grace [21]
3 years ago
7

Seventy percent of the 100 students in middle school cafeteria bought their lunch sone of the students that brought there own lu

nch leave the cafeteria to attend a assembly now only 60% of the remaining students bought their lunch how many students are remaining in the cafeteria
Mathematics
1 answer:
gogolik [260]3 years ago
3 0
So we solve for each
70% of 100=70
students who didn't buy lunch=100-70=30

some of the 70 left so that the students who bought lunch, are 60% of those who are left
we know that the students who didn't buy lunch didn't change number so therefor
100% of students left-60%=40%= students that didn't buy lunch=30 so
40%=30
20%=15
100%=75
there were 75 students lfet in the cafeteria
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Answer:  1.9

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You want to multiply 9x10 which is 90.

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2 years ago
To select a sample of five children from a class of 30, a researcher puts each child’s name on a slip of paper, then shuffles th
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Answer:

We conclude that  a researcher  used simple random sample.

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3 years ago
2. Solve the equation and check.
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8 0
2 years ago
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3 0
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Sharon is conducting research on two species of birds at a bird sanctuary. The number of birds of species A is represented by th
e-lub [12.9K]

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.

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

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.

S=15x+35

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.

For species A, At x=0 , S=0+35=35

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Plot a line with the help of these two points.

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.



8 0
2 years ago
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