If I did it right, it is 120
Answer:
C. 42.
Step-by-step explanation:
This is an arithmetic sequence with common difference d = 4 and first term a = -3.
Sum of n terms = (n/2)[2a + (n - 1)d]
Sum of six terms = (6/2)[2(-3) + (6 - 1)4]
= 3 * (-6 + 20)
= 42.
<span>Find
which of the following cereal is best buy
a. 28 oz for 4.29 dollars
=> 28 / 4.29
=> each 1 oz of cereal cost 6.5
dollars
b. 32 for 4.59 dollars
=> 32 / 4.59
=> 6.97 or 7.00 dollars
=> each 1oz of cereal cost 7.00 dollars
c. 36 oz for 4.79 dollars
=> 36 / 4.79
=> 7.4 dollars
=> each 1oz of cereal costs 7.4
d. 24 for 3.59 dollars
=> 24 / 3.59
=> 6.7 dollars
=> each 1 oz of cereal cost 6.7 dollars
Thus, the best buy cereals is d. 24oz for 3.59 dollars</span><span>
</span>