Question

AB=18, C€AB, AC-BC =4, BC =?

Answer 1

18-4/2 = 7

Объяснение:

Answer 2

Let's break down the information given:

1. AB = 18: This means the length of segment AB is 18 units.

2. C ∈ AB: This notation indicates that point C is located on segment AB.

3. AC - BC = 4: The difference between the length of segment AC and the length of segment BC is 4 units.

We want to find the length of BC. To do this, we can use the information given and set up an equation:

Since C is on segment AB, we can express AC as AB - BC.

So, AC = AB - BC = 18 - BC.

Now, we have the equation: AC - BC = 4.

Substitute the expression for AC from above:

(18 - BC) - BC = 4.

Now, let's solve for BC:

18 - BC - BC = 4.

Combine like terms:

18 - 2BC = 4.

Subtract 18 from both sides:

-2BC = 4 - 18.

-2BC = -14.

Now, divide both sides by -2 to solve for BC:

BC = (-14) / (-2) = 7.

So, BC is equal to 7 units.