Are congruent circles always concentric circles?

A) yes, if they are congruent then they must have the same size and center
B) no, it is not possible for two circles to be the same size with the same center.
C) sometimes, if they have the same center and the same radius length they will be both congruent and concentric.
D) sometimes, if they have the same center and the same chord length then they will be both congruent and concentric.

The average of 5 distinct scores has the same value as the median of the 5 scores. the sum of the 5 scores is 420. what is the sum of the 4 scores that are not the median? * explain how you found the answer * a) 315 b) 320 c) 336 d) 350 e) 360

Add the fractions and simplify 1/2+ 1/3

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)