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Snezhnost [94]
2 years ago
8

Kelly spent $20 on rides and snacks at the state fair if X is that amount she spit on rides and y is the amount she spent on sna

cks the total amount she spent can be represented by the equation X + Y = 20 is the relationship between X and Y linear is it proportional explain.
Mathematics
1 answer:
astra-53 [7]2 years ago
3 0
Since ten plus ten is twenty I think that x and y is ten
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Suppose that 1 kg of Sodium-24 is reduced to 0.0156 kg in 90 hours. What is the half-life, in hours, of Sodium-24?​
N76 [4]

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

7 0
3 years ago
A recipe calls for 3 3/4 cups of flour and Jen put 2 1/3 in a bowl already how much more flour does she need
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