Which equation represents a line which is parallel to the line y = x +33

How can you construct perpendicular lines and prove theorems about perpendicular lines

See attachment below and find the equivalent of tan(∠qsr)

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?