What is the value of 1 − ( 2 − ( 3 − ( 4 − 5 ) ) ) 1 − ( 2 − ( 3 − ( 4 − 5 ) ) )

51

1−2+3−4+5−+101

=(1+3+5++101)−(2+4+6++100)

=(1+3+5++101)−2(1+2+3++50)

=(51)

2

−2(

2

50(50+1)

)

=2601−2×1275

=2601−2550

=51

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

21

jk it's 20

step-by-step explanation: