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tresset_1 [31]
3 years ago
11

Which number sentence does not belong in the fact family for the numbers 7,18, and 23?

Mathematics
1 answer:
telo118 [61]3 years ago
4 0

Answer:

23

Step-by-step explanation:

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The half-life of radioactive cobalt is 5.27 years. Suppose that a nuclear accident has left the level of cobalt radiation in a c
sweet [91]

Answer:

  35 years

Step-by-step explanation:

The proportion p that remains after y years is ...

  p = (1/2)^(y/5.27)

In order for 1/100 to remain (the level decays from 100 times to 1 times), we have ...

  .01 = .5^(y/5.27)

  log(0.01) = y/5.27·log(0.5) . . . take logs

  y = 5.27·log(0.01)/log(0.5) ≈ 35.01 ≈ 35 . . . . years

5 0
3 years ago
The anand group is a shipping company that has just heard the bad news that in shipment of six televisions, two are defective. p
Marina86 [1]
2/3 or 4/6 chance of the tv to work 1/3 or 2/6 chance it won't work.
3 0
3 years ago
A square field has an area of 479 ft what is the approximate length of a size of the field
MissTica

Answer:

21.9 ft

Step-by-step explanation:

The area of a square is the square of the side length, so the side length is the square root of the area:

... s = √(479 ft²) ≈ 21.886 ft

This is approximately 21.9 ft.

4 0
3 years ago
The sale price of every item in a store is 85% of its usual price.
Vladimir [108]

Answer

a. The backpack is $4.50

b. The sweatshirt is $2.70

Step-by-step explanation:

a. 30 x 0.15 = 4.50 (The 0.15 is from the price you are actually paying for the item. Because the item is 85% off, you are paying for 15% of the usual price. 15% as a decimal is 0.15 so you multiply that to the original price to find the amount u will pay.)

b. 18 x 0.15 = 2.70  

5 0
3 years ago
In 2003, the population of an African country was about 13.1 million people, which is 2 million more than 3 times the population
lianna [129]
3p+2.0=31.1
3p=29.1
p=9.7 million people
7 0
3 years ago
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