How many sign changes are in the polynomial f(x) = 3x3 - 7x2 - 9x + 1

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

What is the value of x in the equation7x+2y=48 when y=3