Cookies are sold singly or in packages of 7 or 21. with this packaging how many ways can you buy 42 cookies?

You can buy 42 cookies in 12 ways.

Step-by-step explanation:

The first way of buying 42 cookies is by buying 2 packages of 21 (21x2 = 42).

The second way is by buying 1 package of 21 and 3 packages of 7 (21 + 3x7 = 42).

The third way is by buying 1 package of 21 and 21 single cookies (21 + 21 = 42).

The fourth way is by buying 1 package of 21, 1 package of 7 and 14 single cookies (21 + 7 + 14 = 42).

The fifth way is by buying 1 package of 21, 2 packages of 7 and 7 single cookies (21 + 14 + 7 = 42).

The sixth way is by buying 6 packages of 7 (7x6 = 42).

The seventh way is by buying 5 packages of 7 and 7 single cookies (7x5 + 7 = 42).

The eight way is by buying 4 packages of 7 and 14 single cookies (7x4 + 14 = 42).

The ninth way is by buying 3 packages of 7 and 21 single cookies (7x3 + 21 = 42).

The tenth way is by buying 2 packages of 7 and 28 single cookies (7x2 + 28 = 42).

The eleventh way is by buying 1 package of 7 and 35 single cookies (7 + 35 = 42).

Finally, the twelfth way is by buying 42 single cookies (42 = 42).

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step-by-step explanation:

just for that im not answering

i believe that the answer is

b. y-1=-2(x-4)

hope this !