4años más que el triple de la edad de gabriel

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

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

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup