Question

HELP PLEASE
What is the solution set for the open sentence with the given replacement set?
2t – t = 0, {1, 2, 3, 4}
A:null set
B:2
C:3
D:4
What is the solution set for the open sentence with the given replacement set?
x2 + 12 = 8x, {2, 4, 6, 8}
A:2
B:4
C:5
D:8
Marcus and three of his friends are guessing the radius of a circular pond. They read that the circumference is 157 feet, so they can use the equation to determine which of their guesses, which form the replacement set {20, 25, 30, 35}, is correct.
What is the radius of the pond?
A:20 ft
B:25 ft
C:30 ft
D: 35 ft