Three people become infected with a virus that spreads quickly. each day that passes, the number of infected people doubles. how can the number of infected people be determined from the number of days that have passed?

a: raise the number of days to the second power, and then multiply this value by 3.
b: add the number of days to 3, and then multiply this sum by 2.
c: multiply the number of days by 2, and then add 3 to this product.
d: raise 2 to the number of days, and then multiply this value by 3.

A: Raise the number of days to the second power, and then multiply this value by 3.

Step-by-step explanation:

if we develop a sequence by understanding the situation, it would be like

3, 6, 12, 24, 48,....

here, it is a geometric sequence having common ratio of r=6/3=12/6=2 and first term a1=3;

for the formula says it would have function like this

gaddgad

step-by-step explanation:

for the friend request.

when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.