Examine the following figure.
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if DE || AC, what is the measure of length a?

Please ASAP ANSWER

21

Step-by-step explanation:

BDE and BAC are similar figures

BD/BA = BE/BC

18/(18+36) = a/(a+42)

18/54 = a/(a+42)

1/3 = a/(a+42)

a+42 = 3a

42 = 2a

a = 42/2

a = 21

answer:   rlly

step-by-step explanation:

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: