Which of the following is a precise definition of a circle? A. The set of all points in a plane that are equidistant from a given center point.
B. A three-dimensional shape whose boundary consists of all points equidistant from a given center point.
C The set of all points in a two-dimensional plane that create a diameter.
D. The set of all points that are equidistant to the focus and directrix.

Find the area of a trapezoid with a height of 23, base 1 of 10 and base 2 of 18

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?