Can someone help me with this math homework please!

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)