Which of the following best describes an arrangement of repeating shapes that have no spaces or overlaps between the shapes?
a. polygon
b. platonic solid
c. tessellation
d. line of symmetry

Which graph represents the solution of the inequality?

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?