Jessie tried to solve an equation step by step. \qquad\begin{aligned} 1.5b+9&=11 \\ 1.5b&=3&\green{\text{Step } 1} \\ b&=2&\blue{\text{Step } 2} \end{aligned} 1.5b+9 1.5b b =11 =3 =2 Step 1 Step 2

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297

The triangles are similar. what is the value of x? enter your answer in the box.