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:
if the question is what is the are of the circle without the rectangle inside it, then we could solve it easily using the Mathematical formula for A Circle's area which is
since a radius is half a diameter, and the diameter is 8cm, the radius becomes 4 cm
Step-by-step explanation:
π×4^2
3.14×16
50.24
Answer:
6. Z= -11
7. N= 15.25
Step-by-step explanation:
6. Subtract 10 from each side to get Z+3= -8
Then Subtract 3 from each side to get Z= -11
7. Subtract 4 from each side to get 3/4 n= 16
Then Subtract 3/4 to get N= 15.25
Answer:
130.24
Step-by-step explanation:
8*10+3.14*4^2=
80+50.24=130.24 ft^2
Cut the shape into a semi-circle and rectangle (with length 10 and width 8).
You'll find the radius of the semi-circle is 4.
The area of the rectangle is 80.
Then use the pir^2 formula but replace pi with 3.14
3.14 multiplied by radius 4 squared is 50.24
50.24 plus 80 is 130.24 ft squared.
Answer:
Step-by-step explanation:
The given quadratic trinomial is 
Where a=6, b=-13 and c=-5
The factors of -30 that add up to -13 are -15,2
We split the middle term to get:
Factor by grouping:
These completely factors to:
