What is the variaable in the expression 2/3+U

The triangles are similar. what is the value of x? show your work.

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse