Which is the correct simplification of 2.2x10^4/8.8x10^9

025x10^5
2.5x10^6
0.25x10^-5
2.5x10^-6

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? \ 8,000 + 24x 8,000 - 24x 8,000 + 2x 8,000 - 2x