Cho một hình chử nhật có chiều dài gấp 3 lần chiều rộng. Nếu tăng chiều dài Lên 7cm và giữ nguyên chiều rộng thì diện tích sẽ tăng thêm 630cm2. Tính chu vi hình chử nhật ban đầu.

Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

Which is the focus of a parabola with equation y2=4x

Which of these angles are complementary? a. 45o and 45o b. 63o and 117o c. 45o and 135o d. 90o and 45o