một đoàn tàu có bốn toa đỗ ở ga có bốn hành khách bước lên tàu. Số trường hợp có thể xảy ra về cách chọn của bốn khách là

Any greatly appreciated! you in advance. jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later she's sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions how much money did jody make? a.$65.00b.$5288.00c.$210.00d.$310.00

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10