Answer:
99
Step-by-step explanation:
6 x 6=36
9 x 15=135
135-36=99
Answer: The cost of one bag of chips is $1.5 and cost of one bag of pretzels is $1.05.
Step-by-step explanation:
Let x= Cost of one bag of chips
y= Cost of one bag of pretzels.
As per given, we have
5x+9y=16.95 ...(i)
x+y=2.55 ...(ii)
Multiply 5 to (ii), we get
5x+5y=12.75 ...(iii)
Eliminate (iii) from (i), we get

Put value of y in (ii), we get

Hence, the cost of one bag of chips is $1.5 and cost of one bag of pretzels is $1.05.
You, too, can read the graph and determine that the second selection is appropriate. Or, you can graph it yourself and determine the (one) correct solution.
24 - 3 = 21 cookies given away.
For 7 friends that's 21/7 = 3 cookies each
Check by multiplying 3*7 = 21 cookies for friends. Adding his 3 cookies is 21+3=24 cookies, which is what he started with