Write an expression for the perimeter of the triangle shown below. Then, simplify the expression.

PLEASE INCLUDE EXPLANATION.

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

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