Question

1. what is the value of the expression 10y - z when y = 7 and z = 5?

Explanation:

Step1: Substitute y and z values

Substitute \( y = 7 \) and \( z = 5 \) into \( 10y - z \).
\( 10\times7 - 5 \)

Step2: Calculate multiplication first

Calculate \( 10\times7 = 70 \).
\( 70 - 5 \)

Step3: Calculate subtraction

Subtract 5 from 70.
\( 65 \)

Answer:

65