Suppose C = 30y + 15 and y = 40x + 25. Which of the following is equivalent to C = 30y + 15, but written only in terms of x?

C = 1200x + 450

Step-by-step explanation:

C = 30y + 15... (1)

y = 40x + 25... (2)

Substituting y = 40x + 25 in equation (1)

C = 30(40x + 25) + 15

C = 30*40x + 30*15

C = 1200x + 450

answer with step-by-step explanation:

a. ∠j is supplementary to ∠k - true:

(opposite angles of a trapezoid are supplementary which means that they add up to 180 degrees)

b. kl is parallel to jm - true:

(opposite sides are parallel to each other in a trapezoid)

c. jk is perpendicular to kl - false:

(clearly, jk does not make a right angle with kl)

d. jk is parallel to lm - false:

(jk and lm are two lines opposite in direction to each other so they cannot be parallel)

e. ∠j is congruent to ∠m - true:

(the angles on each side of the base are congruent)

f. ∠j is congruent to ∠k - false:

(the angles on the same side but opposite side of the base are not congruent)

dhhghghghhrhbb it 5

d

step-by-step explanation: