18. Things in the environment people use to meet their needs are: a. Natural resources b. Minerals c. Animals d. Fossil fuels​

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.

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

hey i did something like that before, what is the quesiton?

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.