Step-by-step explanation:
-3(-x -3y) = 3( x +3y) = 3x+9y
Answer:
16/5 or 3 1/5
Step-by-step explanation:
Your equation would be 4/5*4 which equals 16/5
<h2>
Answer:</h2>
The last answer - 9x squared y squared
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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:
$36
Step-by-step explanation:
20x.80=16
20+16=36
Hence, the original price is $36