PLS HELP I NEEED THIS In which of the following expressions is the coefficient of term "x" 1?

2x2+x−9
2 x squared plus x minus 9

x2+2x+7
x squared plus 2 x plus 7

3x2−x−5
3 x squared minus x minus 5

2x2−3x+1

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

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.