Acell phone company charges a monthly fee of $20 for the first 1800 texts and 40 cents for each additional message. miriam's bill for the month is $48.40. how many text messages did she send?

Me find the value of x each figure.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)

Factor this polynomial completely. x^2-8x+12