Write this polynomial in descending order: –4x5 + 4x3 + x7 – 10 + 2x4 I need some help for some questions.. (:

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

If the segment op is dilated by a scale factor r=2, what is the length of segment op? a)10cm b)16cm c)6cm d)4cm

5. divide and simplify if possible. √250x16√2x 6. what is the solution of the equation? √2x+13−5=x