Answer:
Answer is C
Step-by-step explanation:
Answer:
30
Step-by-step explanation:
First, find out how many half-lives have passed. Divide the number of minutes by the length of a half-life.
20÷10=2
2 half-lives have passed.
Now figure out how much nitrogen will be left after 2 half-lives have passed. Multiply the starting amount of nitrogen by
1/2
a total of 2 times.
120x1/2 1/2=30
That calculation could also be written with exponents:
120x(1/2)2=30
After 2 half-lives, the amount of nitrogen left will be 30 grams.
Answer:
You read faster because in 20 minutes you read 16 pages but your friends had 30 minutes they had more time that's why they read more pages not because they read fast
Answer:
100 +3s≥ 160
You must sell as least 20 items
Step-by-step explanation:
You make 100 plus 3 dollars per sale
100 +3s
It must be at least 160
100 +3s≥ 160
Now we need to solve to see how many sales
100 +3s≥ 160
Subtract 100 from each side
100-100 +3s≥ 160-100
3s≥ 60
Divide each side by 3
3s/3≥60/3
s≥20
You must sell as least 20 items
Answer: $320
Step-by-step explanation:
Let the savings of Lucinda is denoted by 'x' .
If the amount she spent was 15% of her savings.
Then , the amount she spent would be 0.15x
[We can write 15% in 0.015 ∵ to convert a percentage sign we divide it by 100.]
It is given that Lucinda spent $48.
Hence, she had $320 as savings before she she shopped.