Show holw you can you use the distributive property to rewrite and find (32x6)+(32x4

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

If 3x+8=3x+8 is it one solution or no solution

See attachment below and find the equivalent of tan(∠qsr)