Which of the following were contributions of shang dynasty craftspeople? silk making and bronze casting bronze casting and iron working jade carving and gold working stone sculpting and steel making

The right answer is "silk making and bronze casting".

Here a quick explanation:

Under the Shang dynasty, the Chinese built large cities with strong social class divisions, expanded irrigation systems, fabricated silk, and monopolized the use of bronze.

d. japan's attack on pearl harbor

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69