Answer:
x = ±3
Step-by-step explanation:
x^2 +3 = 12
Subtract 3 from each side
x^2 +3-3 = 12-3
x^2 = 9
Take the square root of each side
sqrt(x^2) =±sqrt(9)
x = ±3
Answer:
n = 18
Step-by-step explanation:
Corresponding parts of similar triangles are in same ratio

Answer:
She worked 7 hours..........
Step-by-step explanation: