Question

find z:
4(z - 5) = 20
a z = 25
b z = 10
c z = 5

Explanation:

Step1: Divide both sides by 4

To isolate the term with \( z \), we divide both sides of the equation \( 4(z - 5) = 20 \) by 4. This gives us \( \frac{4(z - 5)}{4} = \frac{20}{4} \), which simplifies to \( z - 5 = 5 \).

Step2: Add 5 to both sides

To solve for \( z \), we add 5 to both sides of the equation \( z - 5 = 5 \). So, \( z - 5 + 5 = 5 + 5 \), which simplifies to \( z = 10 \).

Answer:

B. \( z = 10 \)