The variable z is inversely proportional to x. When x is 16, z has the value 0.875. What is the value of z when x=21

The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1400 hours and a standard deviation of 55 hours. Using the empirical rule, what percentage of light bulbs last between 1345 hours and 1455 hours?

Which of the following equations is of a parabola with a vertex at (3, 0) ?

The shape of Oklahoma can be divided into 2 perfect rectangles and 1 triangle. About how many square miles does Oklahoma cover

The perimeter of a rectangle is 24 feet. Find the length if the width is 2 feet what is the length

The measure of one the acute angles in a right triangle is 29 what is the measure of other acute angle in the triangle

Two sides of a triangle measures 20 centimeters and 30 centimeters which of the following could be the measure of the third side

If 2a + 2/a = 4, what is the value of 2a^2 - (2/a^2) ? If 2a + 2/a = 4, what is the value of 2a^2 + (2/a^2) ?

Change 1 h 25 min 29 s to s.

How long would it take to travel 372 miles at 65 mph?

What is the volume of a sphere that has a diameter of 9 yd? Use 3.14 to approximate pi and round the answer to two decimal places if necessary. ___π yd3