Ông X đầu tư vào một dự án với thời gian 4 năm và mong muốn cuối mỗi năm dự án này thu về một khoản tiền bằng nhau là 200 triệu đồng với suất sinh lời là 10%/năm.
a/ Mô tả bằng hình vẽ dòng tiền đầu tư nêu trên?
b/ Xác định giá trị hiện tại của chuỗi thu nhập trên? Nếu ông X bỏ ra 700 triệu đồng thì có
nên đầu tư vào dự án này không?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

In a study of the relationship between socio-economic class and unethical behavior, 129 university of california undergraduates at berkeley were asked to identify themselves as having low or high social-class by comparing themselves to others with the most (least) money, most (least) education, and most (least) respected jobs. they were also presented with a jar of individually wrapped candies and informed that the candies were for children in a nearby laboratory, but that they could take some if they wanted. after completing some unrelated tasks, participants reported the number of candies they had taken. it was found that those who were identiď¬ed as upper-class took more candy than others. in this study, identify: (a) the cases, (b) the variables and their types, (c) the main research question, (d) identify the population of interest and the sample in this study, and (e) comment on whether or not the results of the study can be generalized to the population, and if the ď¬ndings of the study can be used to establish causal relationships.

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work