One week, Lexy went to the donut shop to bring breakfast for her coworkers and she paid $18.40 for 4 coffees and 12 donuts. The next week she paid $2.40 more for 7 coffees and 9
donuts. Which system of equations can be used to find the price per coffee, x, and the price
per donut, y?*

Ihave a 69 and an 82. the 69 is worth 40% of my grade and the 82 is worth 15%. can someone tell me my current average grade.

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

How do you solve a question like this?