Answer:
Answer:1.5*10^9 years
Step-by-step explanation:
The half life of the substance is given i.e 4.5B years. You can change it into seconds by multiplying it with 365 and 86400.
The current no of particles is given 78.88% which will be equal to 78.88 if you assume the substance had 100 no of particle initially.
Determine the decay constant by dividing 0.69 by half life
use these values in the equation for the answer.
[ln and e are inverse functions to eachother]
First, put the data set from least to greatest.
10, 18, 6, 11, 12 → 6, 10, 11, 12, 18
________
Find the median with finding what the middle value of the data set is.
6, 10, 11, 12, 18
Median is 11.
________
Find the mean with adding all the numbers and dividing it by how many numbers their are.
6 + 10 + 11 + 12 + 18 = 57
57 / 5 = 11.4
Mean is 11.4
________
Best Regards,
Wolfyy :)
Answer:
Option B: 
Step-by-step explanation:
When the focus (h, k) of a parabola and the equation of the directrix y = c are given, the equation of the parabola is given by:
Here, we are given the focus: (h, k) = (0, -2)
Directrix: y = c = -3.
We substitute in the formula to get the equation of the parabola.
Dividing by 2, throughout we get:
which is the required answer.
Simplifying
75 + -3.5y + -4y = 4y + 6
Combine like terms: -3.5y + -4y = -7.5y
75 + -7.5y = 4y + 6
Reorder the terms:
75 + -7.5y = 6 + 4y
Solving
75 + -7.5y = 6 + 4y
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '-4y' to each side of the equation.
75 + -7.5y + -4y = 6 + 4y + -4y
Combine like terms: -7.5y + -4y = -11.5y
75 + -11.5y = 6 + 4y + -4y
Combine like terms: 4y + -4y = 0
75 + -11.5y = 6 + 0
75 + -11.5y = 6
Add '-75' to each side of the equation.
75 + -75 + -11.5y = 6 + -75
Combine like terms: 75 + -75 = 0
0 + -11.5y = 6 + -75
-11.5y = 6 + -75
Combine like terms: 6 + -75 = -69
-11.5y = -69
Divide each side by '-11.5'.
y = 6
Answer:
x+10/
Step-by-step explanation:
Quotient of 4 =divide by 4
a number increased by 10= x+10
