Simplify the expressions by combining like terms

4r + 9r - 11r + 7r

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Circle d circumscribes abc and abe. which statements about the triangles are true? statement i: the perpendicular bisectors of abc intersect at the same point as those of abe. statement ii: the distance from c to d is the same as the distance from d to e. statement iii: bisects cde. statement iv: the angle bisectors of abc intersect at the same point as those of abe. a. i only b. i and ii c. ii and iv d. i and iii e. iii and iv