Answer:
84
Step-by-step explanation:
first calculate the rectangle (6* 10 = 60) and then add that to the area of the triangles. 1/2(4) * 6= 2 * 6 = 12, and since there are two triangles: 12* 2 = 24, add that to the area of the rectangle and you get 84.
The mass of substance left after 7 days is 13.09 g
The mass of substance left, N is given by
N = N₀exp(-λt) where λ = decay constant and N₀ = initial mass of substance present = 24 g and t = time
Also, λ = 0.693/t' where t' = half-life of iodine = 8 days
So, λ = 0.693/t'
λ = 0.693/8
λ = 0.086625/day
Since the mass of substance left is N = N₀exp(-λt) and we require the mass of substance after t = 7 days,
N = N₀exp(-λt)
N = 24 gexp(-0.086625/day × 7 days)
N = 24 gexp(-0.606375)
N = 24 g × 0.5453
N = 13.09 g
So, the mass of substance left after 7 days is 13.09 g
Learn more about radioactive decay here:
brainly.com/question/23705307
Answer:
-2.6x^2 - 2
Step-by-step explanation:
I must assume that by " x²_1 " you actually meant " x² - 1."
If that's the case, then our focus becomes simplifying the given expression:
- 2.1x² + 3 – 0.5x² - 1 => -2.6x^2 - 2 (answer)
Answer:
add it
Step-by-step explanation:
add 85 and 77 then minus it from 180
answer will come
