Помогите у меня контрольная

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32