Part D Now that the power of is the same in both figures, you can just look at the first factors of each figure. So, how many ti
mes smaller or larger is the first factor of the mass of an average grain of table salt than the first factor of the mass of an average grain of rock salt?
From part D, the mass of an average grain of rock salt is 120 x 10^-4. The first factor is 120.
The mass of an average grain of table salt is 3 x 10^-4. The first factor is 3. Let x times the first factor of the mass of an average grain of table salt be equal to the first factor of the mass of an average grain of rock salt.
3x = 120
x = 120/3
x = 40
So, the first factor of the mass of an average grain of rock salt (120) is 40 times the first factor of the mass of an average grain of table salt (3).
a) A linear equation can be written as where is the slope and is the intercept on the -axis. The slope describes how changes when changes. A negative value means the it is a decreasing change. In our case, is and is . Thus, the slope of the equation is . This means that the area of glacier is decreasing by every year since 2000.
b) The -intercept (= 16.2 ) represents the area covered when . But starting from year 2000. This intercept then represents the area covered by glacier in the year 2000. Therefore, the area covered by glacier in 2000 was 16.2 .
c) means the area covered after year 2000. Setting it to 12 means the area covered after years is 12 ). is therefore the number of years since 2000 that the total area covered will be 12 ).
d) to 1 decimal place.
e) The term involving represents the disappearing area. In 12 years, the disappeared area is to 1 decimal place.