Please I need a quick help on this one

Determine if the solution set for the system of equations shown is the empty set, contains one point or is infinite. x + y = 5 x + y = 7 {} 1 solution infinite

After college gerald wants to take a graduation trip to china. he wants to save $4,000 for his trip in four years. about how much does gerald have to save each month if his savings earns 7% interest compounded monthly?

Me i have been stuck on this question what is the probability that carol, the 44-year-old you're considering for a 20-year policy, lives to be 64 years old? note that this is a conditional probability. another way of saying this is, "what is the probability that carol turns 64 years old given that she turns 44 years old? " carol is a non-hispanic black female, so look in table 18.