Answer: 51.14
Step-by-step explanation:
-20 = -1 + sqrt(7m+3)
Add 1 to both sides
-19 = sqrt(7m+3)
Square both sides
(-19)^2 = sqrt(7m+3)^2
361 = 7m + 3
Subtract 3 from both sides
358 = 7m
Divide both sides by 7, and round to the nearest hundredth place
m = 51.14
