Answer:
14.99 hours
Step-by-step explanation:
The formula for half-life is given as,
R/R' = 2ᵃ/ᵇ...................... Equation 1
Where R= Original mass of sodium-24, R' = mass of Sodium-24 after disintegration, a = Total time taken for sodium-24 to disintegrate, b = half-life of sodiun-24.
Given: R = 1 kg, R' = 0.0156 kg, a = 90 hours
Substitute into equation 1 and solve for b
1/(0.0156) = 2⁹⁰/ᵇ
Taking the log of both side
log[1/(0.0156)] = log(2⁹⁰/ᵇ)
log[1/(0.0156)] = 90/b(log2)
90/b = log[1/(0.0156)]/log2
90/b = 6.0023
b = 90/6.0023
b = 14.99 hours
b = 14.99 hours.
Hence the half-life of Sodium-24 is 14.99 hours
Answer: $85.38
Step-by-step explanation:
67.95 - 60% + 7% = $67.42
18.49 - 60% + 7% = 17.96
67.42 + 17.96 = $85.38
13(3 + 7)
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Multiply her pay per hour times number of hours worked.
For a normal 40 hour week, she is paid 16.34 per hour:
16.34 x 40 = 653.60
Overtime is any hours over 40, so if she works 60 hours, she would have 20 hours of over time.
Multiply 20 hours by her overtime rate:
20 x 24.51 = 490.20
Now add this to her normal 40 hour pay:
490.20 + 653.60 = 1143.80
So her range is from 40 hours: 653.60 to 60 hours: 1143.80
The answer would be A
