If three numbers m, a, and k form an arithmetic sequence in that order, the sum of the numbers 21, and the product of the numbers is 315, what is the greatest number in the sequence

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

What is the absolute value of the complex number -4-sqrt2i

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)