Think of a number. double the number, subtract 6 from the result and divide answer by 2. the quotient will be 20. what is the number? show you solution pls.

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?