Phân tích thành nhân tử:

a) x2 – 3 ; b) x2 – 6

c) x2 + 2√3 x + 3 ; d) x2 - 2√5 x + 5

When drawing a trend line for a series of data on a scatter plot, which of the following is true? a. there should be an equal number of data points on either side of the trend line. b. all the data points should lie on one side of the trend line. c. the trend line should not intersect any data point on the plot. d. the trend line must connect each data point on the plot.

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

Solve the system of equations. y= 2x y= x^2 - 15