6/8 full i have 12 gallons how many gallons are in 6/8 and add work : 3

Can someone answer it, and plot it, for 20 points and brainliest answer? p. s. they're the same ! : )

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

Which expression shows the sum of the polynomials with like terms grouped together