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Mashutka [201]
2 years ago
13

15PTS PLEASE HELP ASAP! (dont write random answers pls!)

Mathematics
2 answers:
Alenkinab [10]2 years ago
7 0

Answer:

52

Step-by-step explanation:

its too hard to explain

Tcecarenko [31]2 years ago
4 0

Answer:

52

Step-by-step explanation:

.................................

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5(4x-1)-2x=31 what does x equal
ehidna [41]

20x - 5 - 2x = 31

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How do we calculate 25% of 300
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25% is equal to \frac{1}{4}. To get 25% of 300, we multiply 300 by either 0.25 or \frac{1}{4}. This gives us (300)( \frac{1}{4}) =  \frac{300}{4}  =  \frac{150}{2} = 75
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Math help!<br> (check the attachment)
Evgesh-ka [11]
(x-30)+(x+76)=180
x-30+x+76=180
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2 years ago
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The radioactive substance polonium-210, with a half-life of 138.39 days, is present in tobacco. Suppose that the soot in an ex-s
Ksju [112]

Answer:

16.07 milligrams

Step-by-step explanation:

From the question,

Using the formula of radioactive decay,

R/R' = 2ᵃ/ᵇ..................... Equation 1

Where R = Original mass of the polonium-210, R' = Final mass of polonium-210 after decaying, a = Total disintegration time, b = half life of polonium-210.

Make R' the subject of the equation

R' = R/(2ᵃ/ᵇ)................ Equation 2

Given: R = 100 milligrams, a = 1 years = 365 days, b = 138.39 days

Substitute these values into equation 2

R' = 100/(2³⁶⁵⁰⁰/¹³⁸³⁹)

R' = 100/(6.222)

R' = 16.07 milligrams of plonium-210

3 0
2 years ago
Round the number 2.72603 to 2 decimal places.
Solnce55 [7]

Answer:

2.73

Step-by-step explanation:

You round 6 up to get 2.73

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2 years ago
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