Answer: Your bones
Step-by-step explanation: Since your "skeletal system" here is your bones, it helps you walking and running. They move back and fourth along with muscles to help you walk.
Answer:
12y+4x
Step-by-step explanation:
Multiply 4*3y and 4*x
Distributive property
Answer:
Area
Step-by-step explanation:
Answer: -1654
Step-by-step explanation: