Answer:
9
Step-by-step explanation:
4x- 7
Let x=4
4*4 - 7
16 -7
9
It will take 866.09 hours
ANSWER
x=100,y=10
EXPLANATION
The given logarithmic equations are;

This implies that,

and

This implies that,


Put equation (2) into equation (1)



Hence y=10.
This implies

Answer:
The last one
Step-by-step explanation:
You start off with 50.
It says the water is being drained so the slope is negative.