Let me see if I am correct I will get back to u
1) <span>-16a+3+7a-6 = -9a - 3
2) </span><span>14x+8y+12y-20x = 20y - 6x
3) </span><span>-3(8p-6)+4p = 18-20p
4) </span>(9x+2y-8) - (12x+11 = -3x + 2y - 19
Answer: -11 meters
Step-by-step explanation:
so for the waters surface, we are going to call that 0. if bob is at 15 meters below 0, then -15+4=-11, so he would be at-11 meters in relation to the waters surface.