Answer:
the middle 3
Step-by-step explanation:
6^(4-5)
6^(-1)
so three are equal to this
1/6
6^-1
and
1/6^1
If is the water level after days, then at the start we have . After the first day , the water level falls by 1.5, so that . After the second day , the water level falls by a total of 2(1.5) = 3, so that . And so on.
The idea is that has the closed form (to answer part b).
could be any non-negative number of days, which means we can pick from the set of non-negative real numbers. However, after a certain point, our function will start returning negative values, which would translate to the water level falling below the riverbed. So for the purposes of this problem, we should first find out when reaches 0:
That is, the river dries up completely after 14 days. So we can say the domain of is .
The range is the set of values that can take on for the values of in the domain. In this case, we start at 21 and steadily fall to 0, so the range is .
After 9 days, the water level falls to
so in total, the water level would have subsided by a depth of 21 - 7.5 = 13.5 ft.
4/9(2n)+4/9(-3)
(4x2/9)n+(4 x -3)/9
(8/9)n -12/9
8/9n-4/3
32.697 is rounded to (32.7)because the hundreths place is 7 when the number is 5 and up you round up you round the tenths place up to 7