PLEASE HELP I HAVE 25 MINUTES TO SUBMIT MY QUIZ I WILL GIVE 15 POINTS AND BRAINLIST A string variable can only contain numbers.

False

True

Amedian in the road will be marked with a white sign that has a black arrow going to the left of the median. true false

How is the brightness of oled of the diaplay is controled

For positive constants a and b, the force between two atoms in a molecule is given f(r) = −a r2 + b r3 , where r > 0 is the distance between the atoms. note: a and b are upper case letters. (a) find f '(r) = (b) find the critical point for f(r). r = (c) find f ''(r) = (d) find the value of r so that f ''(r) = 0.