Evaluate the expression 7x2y, when x = 4 and y = 2. a.112 b.224 c.542 d.718

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

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.

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.