A survey of a random sample of ninth-grade students from Alabama asked whether the students owned a cell phone and whether they had brought a personal electronic device to use for schoolwork that day. The
two-way table of now relative frequencies below shows the data

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.