The approximate rate of change in the number (in billions) of monthly text messages is given by the equation f prime (t )equals7.9tminus15.1 where t represents the number of years since 2000. In 2002 (tequals2) there were approximately 9.4 billion monthly text messages. Complete parts a. and b. below.
a. Find the function that gives the total number (in billions) of monthly text messages in year t.
b. According to this function, how many monthly text messages were there in 2009?

fsfd

step-by-step explanation:

fdddff

b.-4 units

all you   do is count how many times you move

step-by-step explanation:

we can use this expression to calculate the energy gain as a particle moves with a field or the energy loss as it moves against it. (note that it is also used to define the electron-volt, a unit of energy equal to that gained by an electron as it falls through a pd of 1 v, i.e. w = 1 ev = 1.6 10-19 c 1 v = 1.6 10-19j).in fact this expression is really nothing more than the statement that potential is the potential energy per unit charge. in this case, v= w/qis simply stating that the change in potential energy(or work done) per unit charge is equal to the change in potential (or potential difference), v.student questions: uniform electric fields2electron beamcathode+5 kvanode0 v