0,5, and 8 are the 3 that are correct. You cannot have negative bags of course. Also it cannot be 10 because the balloon cannot hold that much weight.
A 1 = 13, d = 3;
S n = n/2 * ( a 1 + a n )
a 7 = a 1 + 6 d = 13 + 3 * 6 = 13 + 18 = 31
S 7 = 7/2 * ( 13 + 31 ) = 7/2 * 44 = 154
Answer:
D ) 154
1. 40
2. 43
its just like subtracting when you add a negative number to a positive one. flip them around! makes it a lot easier.
16/36=4/9
(16)(9)=(36)(4) cross multiply
144=144 proportional
The marked up price is $126. $134.82-126 =$8.82(The sales tax) :)