The area of a triangle with a base of 20 cm and height of 30 cm is ? 15 Points for answering!

Which pair of angles are vertical angles? ∠1 and ∠4∠1 and ∠2∠2 and ∠4∠2 and ∠3more than one answer.

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Alex took his brother to a birthday party. the party was scheduled to last for 1 and 3/4 hours but they stayed for 4/5 of an hour more. how long did she stay at the party?