Three equivalent ratios for 9/7 15/18 21/28

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

Y=4x^2+x-1 solve using quadratic formula

1. are the triangles similar and if so why? what is the value of x? show your work.