The radius of a semicircle is 2 yards what is the semicircle’s perimeter

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 .

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

How do you write something in scientific notation?