Can someone help me im doing chemistry right now and I have a question which I have no idea how to solve and I need to show work it it needs to be shown in scientific notation (7.6x10^-1)+(2.0x10^-2)

What happens when an acid dissolves?

When using the ideal gas law constant 0.0821, what unit is used for volume? a) galloonb) ouncec) milliliterd) liter

In chile, the deepest earthquake occurred at 61.7°w longitude at a depth of 540 km. if the rocks at the focus began subducting 10 million years ago and are now 1000 km from their original position, what is the average rate of subduction in cm/yr?