Simplify by distributing And/Or Combining Like Terms -3-5x-5y+8x+7y+8

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?

If 25% of y is 30, what is 60% of y?