Answer:
one solution
Step-by-step explanation:
The y-intercept is the y value where the blue line crosses the Y axis which is the vertical black line.
The line crosses at the number 4, so the y-intercept is 4
Answer: D. 4
I’ll help comment the questions and I’ll answer
They are essentially asking us to solve:

Solving this equation for x tells us that it will take around 80.1 years for the materials in the vault to reduce to 357 pounds.
Answer:
Yes
Step-by-step explanation:
A^2+B^2=C^2
11^2+60^2=61^2
121+3600=3721
3721=3721
:)