Answer: they do not have enough info but I will try my best to answer if im wrong its not my fault so please add more info
Solution
2. I know that for a Semi-Circle Area = 320 . From this find out Area of the Semi-Circle.
Solution:
Here Area=320(Given)
Area=
πr2
2
r2=
Area⋅2
π
r2=
320⋅2
22
7
r=14.2701
Diameter(d)=2r
=2⋅14.2701
=28.5402
Circumference=πr
=
22
7
⋅14.2701
=44.849
Perimeter=πr+2r
=
22
7
⋅14.2701+2⋅14.2701
=44.849+28.5402
=89.6979
Step-by-step explanation:
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Answer:
2x + 3
Step-by-step explanation:
product means to multiply, hence
the product of 2 and a number x = 2 × x = 2x
3 more than means add on 3, thus
expression is 2x + 3
Answer:
o
Step-by-step explanation:
Answer:
The half life of a material is the time that a given quantity A of the material, decays into its half.
We know that the half-life is 4 hours, then we have the equation:
Q(t) = A*r^t
Where A is the initial quantity, and t is the number of hours.
and we have that r^4 = 1/2 (so when t = 4, we will have half of A)
then r = (1/2)^(1/4) = 0.84
Then our relation is
Q(t) = A*0.84^t
We have that A = 225mg,
at 1:00 pm. we have one hour after noon, so here we need to use t = 1.
Q(1) = 225mg*0.84^1 = 189.2mg
At 7:00 pm, we have 7 hours since noon, so here we need to use t = 7
Q(7) = 225mg*0.84^7 = 66.4mg
