A half-life of 9 minutes corresponds to a decay factor <em>k</em> such that
Then the time it takes for the substance to decay from 610 g to 124 g is time <em>t </em>such that
Solve for <em>t</em> :
so it takes about 20.7 min for the 610 g sample to decay down to 124 g.
width= 8
Length= 15
(8x15= 120 and 8 is 7 less than 15)
Answer:
F = 1.25
Step-by-step explanation:
All you would have to do is cross multiply, so our equations starts at 
. We would now multiply F by 8 and 2 by 5. We now have 8F = 10. We can now divide both sides of the equation by 8 to get F = 1.25.
As stated the area of the circle is 85π ft2. The area of the sector BAC is a portion of this full circle area. the sector is made of 2 radii and arc that has rotated by 36°.
the magnitude of the central angle in the circle is 360°
Area for 360° central angle - 85π ft2
then the area for 1° = 85π ft2/360°
the area of 36° sector = 85π ft2/360° x 36°
= 8.5π ft2
I believe the answer to your question is the first choice.
Since we have two sides that are 24 mm that means that the equation needs to have 2(24 mm).
And since we have 4 sides that are 18 mm, it means that the equation needs to have 4(18 mm).
so we get: P= 4(18 mm) + 2(24 mm)
Hope this helped and plz mark as brainliest!
