One egg and 2 glass of juice cost $2.30.two egg and 1 juice cost $3.40. what does one egg plus one juice cost?

Simplify the question so it uses x's and y's or any two letters instead of egg/juice (not necessary)

egg = x

juice = y

x + 2y = 2.30

2x + y = 3.40

Make x the subject

x = 2.30 - 2y  

Add pervious step to 2x + y = 3.40 then solve for y

2(2.30 - 2y) + y = 3.40

4.60 - 4y + y = 3.40

4.60 - 3y = 3.40

-3y = -1.20

3y = 1.20

y = 0.40

Now solve for x

x + 2y = 2.30

x + 2(0.40) = 2.30

x + 0.80 = 2.30

x = 1.50

One egg costs $1.50

One juice costs $0.40

Therefore, one egg plus one juice costs $1.90

Simplify the question so it uses x's and y's or any two letters instead of egg/juice (not necessary)

egg = x

juice = y

x + 2y = 2.30

2x + y = 3.40

Make x the subject

x = 2.30 - 2y  

Add previous step to 2x + y = 3.40 then solve for y

2(2.30 - 2y) + y = 3.40

4.60 - 4y + y = 3.40

4.60 - 3y = 3.40

-3y = -1.20

3y = 1.20

y = 0.40

Now solve for x

x + 2y = 2.30

x + 2(0.40) = 2.30

x + 0.80 = 2.30

x = 1.50

One egg costs $1.50

One juice costs $0.40

Therefore, one egg plus one juice costs $1.90

Step-by-step explanation:

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.