Determine the approximate area of trapezoid

Volume of cylinder with a radius of 8cm and height of 25 cm

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.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?