Answer:
K = 27
z = 1.89
Step-by-step explanation:
Check attachment below
The required expression is 100 - 0.2w
Step-by-step explanation:
Given,
Amount of radioactive substance = 100 mg
The substance decreases by 20% each week.
To find the remaining amount of the in w weeks.
Now,
Each week 20% = 0.2 of the substance will be decreased.
So, in w weeks 0.2×w of the the substance will be decreased.
Hence,
The remaining substance = 100 - 0.2w
Answer:
581
mark me as brainliest plz
7=-41-5
7=-36
false
7=3(3)-2
7=9-2
7=7
true
since one is true and one is false its not a solution of the system
