Agrain of sand has a diameter of 0.049 millimeters how do i write that in words

Name the quadrilaterals that have four equal sides.

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

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.