9 raise to the power of 1-x equal to 27 raise to the power of y equal to -1whole number 1/2​

What is the name of the two satelites on mars

Question#29: why does the tropical ocean have a greater temperature range than the temperate ocean?

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