Louie made 8.1 liters of fruit punch using only grape juice and carbonated water. he used 4.2 liters of grape juice. the equation 4.2 + c = 8.1 can be used to represent this situation, where c is the number of liters of carbonated water used. how many liters of carbonated water did louie use?

3.9 liters
4.1 liters
12.3 liters
16.5 liters

Scott harris can invest $7,000 in a 1-year cd that earns interest at an annual rate of 4 percent compounded monthly. the amount per $1.00 is 1.040742. he can also invest $7,000 in a 1-year cd at annual rate of 4 percent compounded quarterly. the amount per $1.00 is 1.040604. what is the difference in the amount of interest earned for each investment? a) $0.96 b) $0.81 c) $0.87 d) $0.88

Find two numbers if their sum is 91 and the ratio is 6: 7?

Why is partitioning a directed line segment into a ratio of 1: 3 not the same as finding the length of the directed line segment?