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Crazy boy [7]
3 years ago
10

There are 20 mice in a 5 m2 field ecosystem. The population density of mice is _____.

Mathematics
1 answer:
Alex17521 [72]3 years ago
6 0
The formula for density = number/ area
In this case number=20
area = 5m^2

Density = 20/5=4 mice per m^2
The right answer is <span>A. 4 per m2</span>

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A small town's phone numbers either begin 373 or 377. How many phone numbers are available?
ser-zykov [4K]

Answer:

  • <u><em>There are 20,000 number available.</em></u>

Explanation:

To determine <em>how many phone numbers are available </em>you need to know how many digits the number contains.

I will assume the same number of digits for other similar questions, i.e. 7.

With 7 digits, the numbers that begin with 373 or 377 can be of the form 373XXXX or 377XXXX.

Where each X can be any digit 0 - 9. Then, there are 10 different options for each X.

Thus, there are 10×10×10×10 = 10,000 different numbers starting with 373 and other 10,000 different numbers starting with 377.

In total, there are 20,000 numbers available.

6 0
3 years ago
Which answer choice shows the decimals in order from least to greatest?
MrMuchimi
I believe the answer is D. 1.121, 1.21, 1.432, 1.53
8 0
3 years ago
12.
kondaur [170]

Answer:

70kilometers

Step-by-step explanation:

first we must find how much one half of a centimeter is

well, its easy, theres already a half for the distance, and the representation is an even number, so cut it in half.

20-10 is 10

and now the multiplication

20x3=60

60+10=70

70 kilometers

3 0
3 years ago
The temperature drops from 7°F to -17°F. By how much did the temperature decrease?
uysha [10]

Answer:

24 degrees

Step-by-step explanation:

If you use 0 as kind of a benchmark it is really useful, frist you subtract 7, because it is our positive number., then you subtract 17 from 0, making -17.

7+17=24

3 0
3 years ago
Read 2 more answers
Complete the coordinate proof for the quadrilateral determined by the points A(7, 9), B(9, 4) , C(4, 2), D(2, 7) . Prove that AB
seraphim [82]

Answer:

its B

Step-by-step explanation:

8 0
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