Suppose a jar contains 10 red marbles and 40 blue marbles. if you reach in the jar and pull out 2 marbles at random at the same time, find the probability that both are red

Given the statements, "a square root of 16 is 4," and "a square root of 9 is -3," complete the following blanks with the correct truth-values. p is and q is , so the statement, "a square root of 16 is 4 or a square root of 9 is -3" is .

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?