Answer: yea i joined H
Step-by-step explanation:
Sin(210) = -0.87 cos(210) = -0.5
The probabilities of picking a red, blue, and yellow marble must be equal to 1. so
P(R)+P(Y)+P(B)=1
1/6+1/2+P(B)=1 making all terms have a common denominator of 6 we have:
1+3+6P(B)=6
4+6P(B)=6
6P(B)=2
P(B)=2/6
P(B)=1/3
Answer:
x=9 if I'm not mistaken
Step-by-step explanation:
8x + 8. 3x + 12
5x -4
14 +4 =18
7x - 5x
2x=18
18÷2 = 9
x=9
the weight of the substance after 28 years is 8 grams.
<h3>How to determine the amount</h3>
We have that the half life of a substance is defined as the time required for the substance to decrease by half
The formula for calculating the half - life of a material is given as;
![N(t) = N0 (\frac{1}{2} )^\frac{t}{t^\frac{1}{2} }](https://tex.z-dn.net/?f=N%28t%29%20%3D%20N0%20%28%5Cfrac%7B1%7D%7B2%7D%20%29%5E%5Cfrac%7Bt%7D%7Bt%5E%5Cfrac%7B1%7D%7B2%7D%20%7D)
Where
- N(t) is final amount
- No is the initial amount = 128 grams
- t1/2 is the half life = 7 years
- t is the time elapsed = 28 years
Substitute into the formula
N(t) = 128 × (0. 5) ^28/ 7
N (t) = 128 × ( 0. 5) ^ 4
N(t) = 128 × 0. 0625
N(t) = 8 grams
Thus, the weight of the substance after 28 years is 8 grams.
Learn more about half life here:
brainly.com/question/26148784
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