The sum of a number and 9 is multiplied by -2 and the answer is 8 find the number. i know the answer is -5 i need a expression, or equation. any of them both

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

The graph below represents which system of inequalities? a. y< -2x+6 y< (or equal to) x+2 b. y< (or equal to) -2x+6 y c. y< 2/3 x - 2 y> (or equal to) 2x +2 d. none of the above