I am a double-membraned cell organelle. I produce energy, so I am known as the 'power house of the cell'. Who am I?

i need this answer quick please !

Convert 9.75 millimeters to centimeters.centimeters

Prompt compare the three types of volcanic mountains in terms of shape, type of eruption, and the minerals that make up the volcano

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes