The radius of a circular mirror is 4 centimeters. what is the circumference of the mirror? tell you what value you used for pi

The equation of circumference is C=pi*d (d=diameter)
If the radius is 4, then the diameter is twice that or 8
If you use 3.14 for pi, you do:
C=3.14*8
C=25.1 rounded to the nearest tenth

the image of (6, 9) under a dilation is (4, 6). the scale factor is

b. 2/3

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?