In the triple beam balance, what is the appropriate number of decimal places?

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Use the given information to determine the exact trigonometric value.