To simplify 48 ÷ 6 • 3, which operation should be performed first?

What values of data might affect the statistical measures of spread and center

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

Simplify the expression below -3(10x+4y)+6(6x-2y)