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olga nikolaevna [1]

3 years ago

7

I really need help on this answer I got it wrong and I don't know which one is right

2 answers:

Dmitry_Shevchenko [17]3 years ago

6 0

Since y=75 and x=1/2 you would need to find the value of y if x is 2 1/4
1/2 +1/2 = 1 75 + 75 = 150
2 wholes = 300
Now you nee to find what 1/4 is
75 divided by 2 is 37.5 so 1/4 is 37.5
300 + 37.5 = 337.5

The answer would be B 337.5
Hope this helps :3

Anna11 [10]3 years ago

5 0

You simply cross multiply. The correct answer is B. I know this becase I had the same exact question in my Staar review packet.

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A substance with a half life is decaying exponentially. If there are initially 12 grams of the substance and after 70 minutes th

77julia77 [94]

Answer: 233 min

Step-by-step explanation:

This problem can be solved by the following equation:

$A=A_{o} e^{-kt}$ (1)

Where:

$A=7 g$ is the quantity left after time $t$

$A_{o}=12 g$ is the initial quantity

$t=70 min$ is the time elapsed

$k$ is the constant of decay for the material

So, firstly we need to find the value of $k$ from (1) in order to move to the next part of the problem:

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Applying natural logarithm on both sides of the equation:

$ln(\frac{A}{A_{o}})=ln(e^{-kt})$ (3)

$ln(\frac{A}{A_{o}})=-kt$ (4)

$k=-\frac{ln(\frac{A}{A_{o}})}{t}$ (5)

$k=-\frac{ln(\frac{7 g}{12 g})}{70 min}$ (6)

$k=0.00769995 min^{-1}$ (7) Now that we have the value of $k$ we can solve the other part of this problem: Find the time $t$ for $A=2 g$ .

In this case we need to isolate $t$ from (1):

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Answer:

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8 0

3 years ago

Pls help I don’t understand

tensa zangetsu [6.8K]

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