Answer: Gravity
Explanation: Gravity is pulling down on the ball, making it stay on the floor
B
Adding more words because it won't let me submit with only one character
Answer:
n = 1,429
Explanation:
In this exercise you are asked to calculate the refractive index, it is a constant that depends on the wavelength and relates the behavior of light when passing through two different material media.
The refractive index of a material is given by
n = c / v
where n is the refractive index, c the speed of light and v the speed in the material medium
let's calculate
n = 3.0 108 / 2.1 108
n = 1,429
Answer:
hi zzayn i will solve this later
Explanation:
Let's establish that x= number of polio vaccinations and y=number of measles vaccinations.
Since Dr. P gave a total of 60 VACCINATIONS, we know that x+y=60. (This is equation #1)
We also know that Dr. P gave a total of 184 DOSES of the vaccinations and that the polio vaccine has 4 doses, while the measles vaccine has 2 doses. This means that our second equation is 4x+2y=184. (This is equation #2)
You can get either variable (x or y) by itself from equation #1. I always choose x.
x+y=60
-y. -y
x=60-y
Now we can plug our x value into equation #2.
4x+2y=184
4(60-y)+2y=184
240-4y+2y=184
240-2y=184
-240 -240
-2y=-56
/-2 /-2
y=28 measles vaccines
So we know that Dr. P administered 28 measles vaccines. We need to plug our y value back into equation #1 (or, to make it easier, our switched around equation) to find the number of polio vaccines.
x=60-y
x=60-28
x=32 polio vaccines
