The circumference of a circle is 4 pie centimeters. What is the radius?

r=2

Step-by-step explanation:

The circumference of a circle is : P = 2πr... r : the radius and  P= 4π

so :  2πr = 4π

divide by :  2π  you have :  r = 2

2cm

Step-by-step explanation:

Circumference of a circle =2pir

Circumference given=4pi

R=?

Substitute the values

2pir=4pi

Pi cancel pi

2r=4

R=4/2

R=2

Radius of the circle is 2cm

when rotating a figure 180 degrees, imagine that you are able to take the figure and turn it clockwise or counterclockwise around a center point. to rotate a figure 180 degrees, you will need to apply the rule (x, y) → (-x, -y). start by using a coordinate grid with coordinates for each vertex of the figure. the center point of the coordinate grid is located at (0, 0), which is what you will rotate the figure around. write down the original coordinates of the shape you are going to rotate. then, apply the rule. for example, coordinate (1, 2) becomes (-1, -2). another example would be, coordinate (-4, -2) becoming (4, 2). after you change each original coordinate to the rotated coordinate, you will draw your new figure.

step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)