60 POINTS Answer correctly please this depeneds on my dumb GRADE PLEASE

I dont need a big explantion just give the correct answer if you get it wrong your banned I swear

Which best explains why this triangle is or is not a right triangle ?

How many four digit even numbers can be formed from digits 1,2,3,4,5 if repetition is allowed. how can solve this using permutation formula

Complete the statements about the two cones. the volumes of the cones are equal when . if a > b, then the cross-sectional area of cone a is the cross-sectional area of cone b at every level parallel to their respective bases.