what does pre-image mean ? like when your using a graph & they ask “what the preimage of (4,2) what does that mean ?

If f(x) = 2x + 2 and g(x) = x? , what is (gºf)(2)?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Acircle has a circumference of 28.36 units what is the diameter of the circle