If l m, identify the angle pair as congruent or supplementary. Justify your reasoning by classifying the angle pair: I only need the ones on the bottom.

The triangles are similar. what is the value of x? show your work.

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

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.