Work out the perimiter of a semi circle with radius of 3
Give your answer in term of pi

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Which of the following expressions is equal to 2x^2+8

Find the nonpermissible replacement for binthis expression. b2/5b +5