Plsss answer everything you know i need the answer asap

1) Answers: Bobby = 22, Chris = 19

Explanation:

                   This year         Last year

Bobby:      3 + x              3 + x - 1   = 2 + x

 Chris:         x                       x - 1

Bobby (last year) + Chris (last year) = sum (last year)

       2 + x             +          x - 1            =       39

2 + x + x - 1 = 39

2 + 2x - 1 = 39

2x + 1 = 39

2x = 38

x = 19

Bobby (this year): 3 + x   = 3 + 19   = 22

Chris (this year):   x = 19

2. Answers: Beth = 25, Celeste = 30

Explanation:

                  This year          Next year

Beth:             x - 5               x - 5 + 1   = x - 4

Celeste:          x                        x + 1

Beth (next year) + Celeste (next year) = sum (next year)

         x - 4           +           x + 1               =     57

x - 4 + x + 1 = 57

2x - 3 = 57

2x = 60

x = 30

Beth (this year): x - 5   = 30 - 5   = 25

Celeste: x = 30

3. Answers: Donna = 38, brother = 50

Explanation:

                  This year             in 2 years

Donna:         x - 12                  x - 12 + 2       and       (x + 2)/2 + 14

brother:          x                           x + 2

Donna (in 2 years) = Donna (in 2 years)

        x - 10          =         (x+2)/2 + 14

x - 24 = (x+2)/2

2x - 48 = x + 2

x = 50

Donna (this year): x - 12    = 50 - 12   = 38

brother: x = 50

4. Answers: Freddie = 40, Elena = 8

Explanation:

                  This year             in 4 years

Freddie:          5x                     5x + 4      and       3(x + 4) + 8

Elena:               x                       x + 4

Freddie (in 4 years) = Freddie (in 4 years)

          5x + 4            =        3(x + 4) + 8  

5x + 4 = 3x + 12 + 8

2x = 16

x = 8

Freddie: 5x   = 5(8)   = 40

Elena: x   = 8

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

linear pair postulates