Nosheen travels from home to school. She travels by bus or by car or by tram. The probability that she travels by bus is 0.4 The probability that she travels by car is 0.5 Work out the probability that she travels by tram.

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.