Which of the following sets is equal to {1, 2, 3, ...}?

A) {x | x ∈ R, x > 1}
B){x | x ∈ R, x ≥ 1}
C) {x | x ∈ N, x ≥ 1}

275/20 simplified (lmbo it told me to add more characters)

Sweet t saved 20 percent of the total cost of the green-eyed fleas new album let there be fleas on earth. if the regular price is $30 how much did sweet save

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?