Arhombus has an area of 33 square centimeters. if the length of one diagonal is 11cm, what's the other length?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Can someone me with this problem i don't understand i need

Negative 5 1/12 + negative 4 1/4 + 6 3/4