What type of error is caused by the improper administration or execution of the research task? bias error administrative error sampling error structural error?

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?