Dimitri is solving the equation x2 – 10x = 21. Which value must be added to both sides of the equation to make the left side a perfect-square trinomial?

What term best describes a line and a point that lie in the same plane? a. congruent b. coplanar c. collinear d. equal

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?