Is there a difference between all real numbers and infinitely many solutions?

Asequence of numbers begins with 12 and progresses geometrically. each number is the previous number divided by 2. which value can be used as the common ratio in an explicit formula that represents the sequence? 1/2 2 6 12

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section