Which one of the following statements is true of perpendicular lines?

a. they intersect at one point.
b. they never intersect.
c. they intersect to form an acute angle.
d. they intersect to form an obtuse angle

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

The rumpart family is building a new room onto their house. the width of the new room will be 16 feet. the length of the room will be 4% greater than the width. write an expression to find the length of the new room. what will be the area of this new room?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126