The question is incomplete, here is the complete question:
Recall that m(t) = m.(1/2)^t/h for radioactive decay, where h is the half-life. Suppose that a 500 g sample of phosphorus-32 decays to 356 g over 7 days. Calculate the half life of the sample.
<u>Answer:</u> The half life of the sample of phosphorus-32 is 
<u>Step-by-step explanation:</u>
The equation used to calculate the half life of the sample is given as:

where,
m(t) = amount of sample after time 't' = 356 g
= initial amount of the sample = 500 g
t = time period = 7 days
h = half life of the sample = ?
Putting values in above equation, we get:

Hence, the half life of the sample of phosphorus-32 is 
Answer:
All the numbers with the same variable(or none), or in this case 1/7, 3/7, 2/7 are like terms.
Step-by-step explanation:
n is a variable that all other number does not have.
You should model it if you know the thingy to the answer then multiply the dividend to get the multiplcation using the essenials standard algarithm for properties of equality.
Answer:
x = 
Step-by-step explanation:
10 - 2 + 6 = 3x (7 + 8)
3x (7 + 8) = 10 - 2 + 6
21x + 24x = 8 + 6
45x = 14
x = 14 ÷ 45
x = 
For the equation to equal x would be -1.
x = -1
-2 (-1+2) = -2 +1
-2+1 = -2+1