Try the numbers 9, 10, 11, 12 in the equation 60 - 3 ⋅ z = 30

to test whether any of them is a solution.

a. 11 is a solution. c. 12 is a solution.

b. 10 is a solution. d. 9 is a solution.

10 is a solution.

Step-by-step explanation:

Step 1: Equation is 60 - (3 * z) = 30 Substitute values of 9, 10, 11 and 12 to find the solution.

When z = 9, 60 - (3 * z) = 60 - (3*9) = 60 - 27 = 33 ≠ 30

When z = 10, 60 - (3 * z) = 60 - (3*10) = 60 - 30 = 30

When z = 11, 60 - (3 * z) = 60 - (3*11) = 60 - 33 = 27 ≠ 30

When z = 12, 60 - (3 * z) = 60 - (3*12) = 60 - 36 = 24 ≠ 30

⇒ 10 is a solution.