Answer:
1
Step-by-step explanation:
Its B. Huhu you can press the calculator and get the answer:>
Answer: B. (-6, 8).
Step-by-step explanation:
-4r-11=4r+21
Move 4r to the other side
Sign changes from +4r to -4r
-4r-4r-11=4r-4r+21
-4r-4r-11=21
-8r-11=21
Move -11 to the other side
Sign changes from -11 to +11
-8r-11+11=21+11
-8r=21+11
-8r=32
Divide both sides by -8
-8r/-8=32/-8
Answer: r=-4
20*2=40
40*50=2000
2000/60=33.33
about 33 hours by lifting by hand