4.2 is the answer. Hope this answered your question
Answer:
814.5 mg remain after 4 hours
Step-by-step explanation:
The multiplier of the original quantity is 1 -5% = 0.95 for each passing hour. The amount remaining after x hours is ...
y = 1000·0.95^x
For x=4, the amount remaining is ...
y = 1000·0.95^4 = 1000·0.81450625
y ≈ 814.5 . . . mg remain after 4 hours
A number is less than 4 units from 0
-4<x<4
Answer:
The unit rate is 20.8 ft/ sec.
Step-by-step explanation:
It is given that the displacement of 644.8 ft in 31 s.
When the rate is define in the quantity of 1, then it is called unit rate.
In 31 s the displacement is 644.8 ft.
Divide both sides by 31,
For one second the value of the displacement is 20.8.
Therefore the unit rate for 644.8 ft in 31 s is 20.8 ft/sec.
Use the slope formula
(y₂ - y₁)/(x₂ - x₁)
Let (0,2) = (x₁, y₁)
Let (3,0) = (x₂, y₂)
Plug into corresponding variables
(0 - 2)/(3 - 0) = -2/3
-2/3 is the slope of the line given
-------------------------------------------------------------------------------------------------------
To find the perpendicular line, flip the slope around and change the sign.
-2/3 becomes 3/2
The perpendicular line's slope is 3/2
-------------------------------------------------------------------------------------------------------
hope this helps
