, 18.10.2019 06:30, 2sally2

# Kira, goran, & joe sent a total of 90 text messages during the weekend. goran sent 5 fewer messages than kira. joe sent 3 times as many messages as kira. how many messages did they each send

### Other questions on the subject: Mathematics

Mathematics, 21.06.2019 22:00, dest8860
Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b