Which advance made a network of railroad lines possible? a. the air brake c. the convertible berth b. a standard gauge d. the dining car Which advance made a network of railroad lines possible? a. the air brake
c. the convertible berth
b. a standard gauge
d. the dining car

pls help

A.

Explanation: because I just did the quiz and got it right

the question deals with financial planning and the answer is that dan did not stay on budget due to the fact that this guy needs to start decreasing his discretionary spending. according to the financial plan, he needed to balance his expenses and resources.

jupiter is mainly composed of hydrogen and helium just like a star. spectral analysis of jupiter has revealed that in addition to hydrogen and helium, the planet is made of water, methane and ammonia. those elements are in trace amounts. the core of the planet is thought to contain some rock and metallic hydrogen. i hope this will give you the answer to your question! : d