Use Einstein's special-relativity equation Upper R Subscript a Baseline equals Upper R Subscript f Baseline StartRoot 1 minus left parenthesis StartFraction v Over c EndFraction right parenthesis squared EndRoot , which gives the aging rate of an astronaut, Upper R Subscript a, relative to the aging rate of a friend, Upper R Subscript f, on Earth. In this formula, v is the astronaut's speed and c is the speed of light. Suppose an astronaut is moving at 40% of the speed of light. Substitute 0.4c for v, the astronaut's velocity, in the equation. What is the aging rate of the astronaut relative to a friend on Earth? If the astronaut was gone for 92 weeks, approximately how many weeks have passed for the friend?
What is the aging rate of the astronaut relative to a friend on Earth?

step-by-step explanation:

the correct answer is the second option

because they could drop even lower..

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'.