The ratio of the loudness of Lana’s earphones to the loudness of Polina’s earphones to the loudness of Goffy’s earphones is 6:5:3. If Polina’s earphones have a loudness of 90 decibels, find the total loudness of all three earphones.

252

Step-by-step explanation:

sum of ratio=6+5+3=14

Total loudness=90/5 ×14=18×14=252

b 1: 45 am

step-by-step explanation:

its that because if it was in the pm it would be 1345

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.