1 người đi quãng đường AB dài 90km. Vận tốc khi đi là 10km/h.Đoạn đường còn lại đi với vận tốc 20km/h. Người đó đi quãng đường AB hết 7h. Hỏi thời gian người đó đi quãng đường với vận tốc 10km

Your answer is c. explanation: plasma  is the fourth state of matter, derived from the gaseous state of matter.  plasma  can contain free  electrons  and/or  ions. while  plasma is never neutral, it can either be positively or negatively charged.  gases, however, are electrically neutral.

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.