susan is trying to figure out a seating arrangement for her dinner party. when she seats guests in pairs, there is one person left over. when she seats them in threes, there is one person left. when she seats them in fours, there is one person left over. when she seats them in fives, there is one person left over. what is the least number of people at the party

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Select all the statements that apply to this figure

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?