Change 12% as a decimal

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.

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)