7th grade math need help ASAP will mark brainlist

Whose conclusion is correct? choose all that apply. (two max) elijah emily edward esme

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

Non-euclidean geometry was discovered when, in seeking cleaner alternatives to the fifth postulate, it was found that the negation could also be true a. true b. false