Nis an integer s=1/2 n(n+1) prove that 8s + 1 is an odd square number

It says factor each expression 49x-28?

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

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account