Which statements best describe magnetic fields? Check all that apply.

-A magnetic field is a region where a magnetic force is exerted on certain objects.

-Magnetic field lines form closed loops that spread out of the north end of a magnet

Magnets have a magnetic field around them.

Materials that are attracted to a magnet contain iron, cobalt, or nickel.

Magnets act at a distance.  

Magnets have two poles.

Explanation:

the answer to this question is 60 n

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)