Which sample size will produce a margin of error of +- 6.3%?

Asap 25 pts + brainlest to right/best answer

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

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