The 11/2 cup of black beans is extraneous info, you just need to know that it provides 15% of the potassium you need daily. With that info, you know that you need 85% more to fulfill your daily value. If we say x is the total amount of potassium needed, then we can set up the equation:
x * 0.85 = 2890
Then we can solve for x by dividing both sides by 0.85. The answer, then, is 2890/0.85 = 3400 mg.
A few tips:
- If the numbers are in negatives, the greatest number should be the closest from 0.
- If the numbers are in positives, the greatest number should be farthest from 0
- If the numbers are in positives and negatives, the number which is farthest from 0 will be the greatest.
Solution (Verification for Option A):
<u>In this case, all the numbers are in negatives.</u>
- => -3 > -4 > -7 > -8 > -9 (Correct)
Solution (Verification for Option B):
<u>In this case, a few numbers are in positives and in negatives.</u>
- => 9 > 7 > 6 > -5 > 4 (Incorrect)
Solution (Verification for Option C):
<u>In this case, a few numbers are in positives and in negatives.</u>
- => 8 > -6 > 5 > -4 > 1 (Incorrect)
Solution (Verification for Option D):
<u>In this case, a few numbers are in positives and in negatives.</u>
- => -3 > -1 > 0 > 2 > 7 (Incorrect)
Conclusion:
Answer: The sum of rational and irrational number is always irrational...
It will take 7.5 hours for only 40% of the caffeine to remain in his body.
Step-by-step explanation:
Half-life (symbol t1⁄2) is the time required for a quantity to reduce to half of its initial value.
The half-life of caffeine is 5.7 hours.
It means that if we have 10 ounces of caffeine. After 5.7 hours, the remaining caffeine will be equal to 5 ounces and so on.
And the decaying speed depends on the initial amount of the substance.
In the given question.
t1⁄2 = 5.7 hours
Initial amount = N(i) = 16 ounces
Remaining amount after time t = N(t) = 40% of 16 = 6.4 ounces
time t = ?
Using the following formula for remaining amount of substance after time t:
N(t) = N(i)*(0.5)^(t/t1⁄2)
we can find the time t
putting the values in the formula given above, we get:
Taking natural log on both sides:
Learn more about Half-life from brainly.com/question/12341489
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