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.

the best buy, is the 4- kilogram bag of lollipops for $18.40.

step-by-step explanation:

i found my answer by dividing the cost of each bag by their respective weights.

14.88 divided by 2 = 7.44

17.29 divided by 3 = 5.77

18.4 divided by 4 = 4.6

24.4 divided by 5 = 4.88

by this, i found that the 4 kilo bag is the best buy.