问题描述：
A highly volatile substance initially has a mass of 1200g and its mass is reduced by 12% each second.
Q1.Write a formula that gives the mass of the substance(m) at time(t) seconds.
Q2.Rearrange this formula to make t the subject.
Q3.What mass remains after 10 seconds,correct to two decimal places?
Q4.Calculate how long (to the nearest seconds) it takes until the mass is 10 grams.
Q5.After how many seconds (to the nearest seconds) is the mass less than 1 gram?
题的意思我知道
Q1.Write a formula that gives the mass of the substance(m) at time(t) seconds.
Q2.Rearrange this formula to make t the subject.
Q3.What mass remains after 10 seconds,correct to two decimal places?
Q4.Calculate how long (to the nearest seconds) it takes until the mass is 10 grams.
Q5.After how many seconds (to the nearest seconds) is the mass less than 1 gram?
题的意思我知道
问题解答：
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