Like i tried to figure it out but i just can't

This is the equation of an ellipse. the 225 is the 15², it is longer than 81 (9²), so the major axis is the x axis. 
centered at (0, 0), it goes left and right 15 units each, so the total length is 30 units. choice A is the correct answer. 

Bi’m pretty sure hope it works

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.