Can you find the sum [5.5 + (-2.3)] + (-5.5 + 2.3) without preforming any additions?

What value of x is in the solution set of 4x – 12 s 16 + 8x?

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

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.