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hram777 [196]
2 years ago
9

Simplify. 5 • 2 • (–4) + 6 ÷ 2

Mathematics
1 answer:
Natasha2012 [34]2 years ago
4 0

Answer:

- 37

Step-by-step explanation:

5 • 2 • ( - 4 ) + 6 ÷ 2

= 5 • 2 • ( - 4 ) + [ 6 ÷ 2 ]

= 10 • ( - 4 ) + 3

= - 40 + 3

= - 37

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Element X decays radioactively with a half life of 11 minutes. If there are 870 grams
exis [7]

Answer:

27.5 minutes

Step-by-step explanation:

Using,

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

From the equation,

R = mass of Element X before radioactive decay, R' = mass of element X after radioactive decay, a = Time taken, b = half life.

Given: R = 870 grams, R' = 154 grams, b = 11 minutes.

Substitute these values into equation 1

870/154 = 2ᵃ/¹¹

(870/154)¹¹ = 2ᵃ

Solve for a

2ᵃ = (5.649)¹¹

2ᵃ = 187061.26

Taking the logarithm of both side,

Log2ᵃ = Log(187061.26)

⇒ a = log(187061.26)/log2

a = 8.272/0.301

a = 27.5 minutes

5 0
3 years ago
Can someone help me with this question please?
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8 0
3 years ago
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igomit [66]

Step-by-step explanation:

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5 0
3 years ago
Are the ratios 1:2 and 10:20 equivalent <br><br><br>YES OR NO​
nignag [31]

Answer:

yes

Step-by-step explanation:

10:20=

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6 0
2 years ago
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Brenda has $500 in her bank account. Every week she withdraws $30 for
JulsSmile [24]

Answer:

10 weeks

Step-by-step explanation:

lets build a equation for this

500-30(x)........where x is the number of weeks

500-30(10)= $200 left

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5 0
2 years ago
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