25.3-x=104

75-x=104

x=75-104

x=-29

3(5x-15)-52=68

3(5x-15)=68+52

3(5x-15)=120

5x-15=120:3

5x-15=40

5x=40+15

5x=55

x=55:5

x=11

5(x+35)=515

x+35=515:5

x+35=103

x=103-35

x=68

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

  After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75, 000, and the trend of lower enrollment rates is expected to continue.

          There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question: "Is an MBA degree really what I need to be best prepared for getting a good job?". The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands.

The phrase “trend of” in line 5 is closest in meaning to which of the following?

A. reluctance of

B. drawback to

C. movement toward

D. extraction from

hêlô

Ở điều kiện thường, kim loại nào sau đây không phản ứng với nước?

A. Li

B. K

C. Sr

D. Be

Lên men a gam glucozơ, cho toàn bộ lượng CO₂ sinh ra hấp thụ vào dung dịch nước vôi trong tạo thành 20 gam kết tủa. Khối lượng dung dịch sau phản ứng giảm 6,8 gam so với ban đầu, hiệu suất quá trình lên men là 90%. Giá trị của a là

A. 30 gam

B. 10 gam

C. 20 gam

D. 40 gam

Công thức phân tử nào sau đây phù hợp với một este no, mạch hở?

A. C₁₂H₁₆O₁₀

B. C₁₀H₂₀O₄

C. C₁₁H₁₆O₁₀

D. C₁₃H₁₅O₁₃