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:

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.

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step-by-step explanation: