Solve 2x+4 so that it has one solution

-2

Step-by-step explanation:

We can set it equal to zero

2x+4 = 0

2x =-4

x = -2

x = -2

Step-by-step explanation:

To solve for variables, we need the equation to be set equal to something. If no other number is given, assume zero.

2x + 4 = 0

Move 4 to the right by subtracting it from the left and right (since it is being added).

2x = -4

Next, isolate x by dividing both sides by 2 (since x is being multiplied by 2)

x = -2

We can check that this is correct by plugging in -2 for x and seeing if we get zero.

2(-2) + 4 = 0

-4 + 4 = 0

0 = 0

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0