Answer:

Step-by-step explanation:
We need to find 
We know that √-1 = i
Adding -49 and -4 and solving

Since 53 is not a perfect square so our answer is:

Answer:
second one
Step-by-step explanation:
above sea level means it’s positive
below sea level is negative
(think of the sea level as 0)
the student should be using this equation
29,035-(-1,349) not 29,035-1349
Answer:
f(-7) = -3
Step-by-step explanation:
f(x) = ( x-2)/3
Let x = -7
f(x) = ( -7-2)/3
= (-9)/3
= -3