In trapezoid $abcd$, sides $\overline{ab}$ and $\overline{cd}$ are parallel, $\angle a = 2\angle d$, and $\angle c = 3\angle b$. find $\angle b$.

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?