A) 12 ft
b) 21 ft
c) 63 ft
d) 81 ft

Can someone me out here number 4 plz

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.