1 In the equation x + 8.2 = –12.7, 8.2 is being added to the variable, x. How should you show your work to isolate the variable and solve the equation?

Subtract –12.7 from both sides. The solution is 20.9.

Add –12.7 to both sides. The solution is –4.5.

Subtract 8.2 from both sides. The solution is –20.9.

Add 8.2 to both sides. The solution is –4.5.

What percent of the circle below is shaded?

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

If value of cos330° is √3/2 then find tan165°.