The diameter of a circle is 4 cm. Which equation can be used to find its circumference? C = pi times 2 C = pi times 4 C = StartFraction pi times 4 over 2 EndFraction C = StartFraction pi times 4 over 4 EndFraction

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no