Answer:
whats the answers available?
Step-by-step explanation:
Answer:
8/13
Step-by-step explanation:
<em>Step 1 : Write all the data</em>
Total number of students = 26
Number of girls in class = 10
Number of boys in class = 26-10 = 16
<em>Step 2 : Find the probability</em>
Probability of pulling out a boy's name = <u>number of boys in class</u>
Total number of students in class
= 16/26
<em>Simplify :</em>
16/26 = 8/13
!!
Answer: C. 100
Step-by-step explanation:
If the large tank is flowing at a constant rate of -6 per minute then we have to know that the water is moving from the tank. So is asking how many water will be left in the tank after 25 minutes.
You could use the equation
y = -6x + 250 where y is the amount of water left in the tank and x is the number of minutes.
So if x is 25 then plot it in and solve for y.
y = -6(25) +250
y = -150 +250
y= 100
Answer:
The answer is A. Check the picture attached.
Step-by-step explanation:
Answer:
23 years
Step-by-step explanation:
Step 1: Calculate the rate constant (k) for the radioactive decay
A radioactive substance with initial concentration [A]₀ decays to 97% of its initial amount, that is, [A] = 0.97 [A]₀, after t = 1 year. Considering first-order kinetics, we can calculate the rate constant using the following expression.
ln [A]/[A]₀ = - k.t
k = ln [A]/[A]₀ / -t
k = ln 0.97 [A]₀/[A]₀ / -1 year
k = 0.03 year⁻¹
Step 2: Calculate the half-life of the substance
We will use the following expression.
= ln2/ k = ln 2 / 0.03 year⁻¹ = 23 years
