Answer:
g=-19+9
g=-10
Step-by-step explanation:
51 as a decimal is .51 and 100 as a decimal is 1.00
51100 as a decimal is 511
SA=4pir^2
78.54km^2=SA
78.54=4pir^2
divide both sides by 4
19.635=pir^2
aprox pi=3.14 so divide both sides by 3.14
6.25318=r^2
sqrt both sides
2.50063=r
round
radius=2.5km
this question is flawed in that it gives the wrong units
answer is the option with 2.5 in it
2nd one
