Halle M+N si -M es el descuento único de dos descuentos sucesivos del 20% y 25%
-N es el aumento de dos aumentos sucesivos del 10% y 30%

Hi my sisters and brothers can tell me the answer because i don’t understand the question

100 points, hi, i’m not sure what to do here, the data doesn’t seem to be quadratic .? can anyone me, in advance

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?