First we define the variable to be used:
x: half-life time period
The equation for this problem can be modeled as:
y = A * (b) ^ x
Where,
A: initial amount
b: decrease rate.
For example:
if there are 100 atoms, after one half-life time period, 50 atoms remain:
y = 100 * (0.50) ^ x
after one half-life time period (x = 1):
y = 100 * (0.50) ^ 1
y = 50
The equation that models the problem is:
y = 16 * (0.50) ^ x
The table is:
1 8
2 4
3 2
4 1
5 0.5
<span>a1:f9 is not an valid range because it has neither a row nor a column in common. This contrasts with a1:a3, b1:b3, and a1:a9 which each have a row in common, as well as with a1:f1, which has a column in common.
In general, to make a valid range coordinates must be specified that allow a single row or column of cells to be specified.</span>
Answer:
The actual dimensions of the closet are 2 ft by 3 ft.
Step-by-step explanation:
According to the scale, 1/4 inch <--> 1 foot
The closet dimensions on the scale are (1/2 inch, 3/4) or (2/4 inch, 3/4). Let the real closet dimensions be (x,y).
In this case, the rule of three can be applied to find the missing term of a proportion:
The actual dimensions of the closet are 2 ft by 3 ft.
Answer: Mary can expect to answer 60 questions in a 150 minutes
Step-by-step explanation:
150 divided by 30 = 5
5 x 12 = 60
