If a+3b = 7, 3b+2c = 9 and c+d = 1. How much is 2a + 15b + 10 c + 4d = ?

What numbers are included in the set of integers? what numbers are not included?

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

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.