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nignag [31]
3 years ago
8

Ve spent the whole weekend grading math assignments. I graded 30 students

Mathematics
1 answer:
OLga [1]3 years ago
3 0

Answer:

75

Step-by-step explanation:

How many students is 1% of the class, 30/40=0.75, so you could do 0.75x100=75, or you could do 0.75x60=45, and 45+30=75.

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3 years ago
Element X decays radioactively with a half life of 13 minutes. If there are 560 grams
deff fn [24]

The time taken for the element X to decay from 560 grams to 150 grams is 24.7 mins

<h3>How to determine the number of half-lives </h3>
  • Original amount (N₀) = 560 g
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2ⁿ = N₀ / N

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Log 2ⁿ = Log 3.73

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Divide both side by Log 2

n = Log 3.73 / Log 2

n = 1.9

<h3>How to determine the time </h3>
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  • Half-life (t½) = 13 mins
  • Time (t) =?

t = n × t½

t = 1.9 × 13

t = 24.7 mins

Learn more about half life:

brainly.com/question/26374513

7 0
1 year ago
Which statement correctly describes the relationship between quadrilateral ABCD and quadrilateral A′B′C′D′ ? An x y coordinate p
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3 years ago
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