Ur answer is going to be 10
Answer:
B. 550
Step-by-step explanation:
I took the test. Please mark brainliest.
Answer: OK so you should
Step-by-step explanation:
Use math papa.com for help dm me if u need the link
ANSWER
EXPLANATION
We want to write the equation of a parabola with vertex (-5,8) and directrix x=2.
The equation of the directrix tells us that, the axis of symmetry of the parabola is parallel to the x-axis.
This type of parabola has equation of the form:
p is the focal length of the parabola.
p=-7 because the parabola opens along the negative x-axis.
Hence the equation is
This could be rephrased as:
You start with 100 grams of a substance. One year later you have 70 grams. What is the half-life?
We need this formula:
half-life = (time * natural log (2)) / natural log (beginning amount / ending amt)
half-life = (1 year * .69315) / natural log (100 / 70)
half-life = (.69315) / 0.35667494396
half-life = 1.9433661145 years
Rounding to nearest year half-life = 2 years
Sourse: https://www.1728.org/halflif2.htm
(See problem 3)