What is the value of the expression2.8x10*7a. 2.0 x 10*4b. 2.0 x 10*10c. 1.4 x 10*4d. 1.4 x 10*10

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Do, h = (7, 9) (14, 18) the scale factor is