If a=bh, and if b=12 and h=8, what does a equal?

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.