The average of four numbers is 98. if three of the numbers are 86,87,and 91 what is the fourth number?

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

Ineed with number 6 , explain how to get 1978