Which of the following statements are TRUE?
I. In an observational study subjects are randomly assigned to treatment groups.
II. A systematic sample is an example of an SRS because every experimental unit has
an equal chance of being chosen.
III. Blocking is for experiments and stratifying is for studies.
A. I only
B. II and III
C. I, II and III
D. I and III
E. III only

a) t'(-3, 6) and v'(0, 3)  

step-by-step explanation:

the highest percentage for deaths in construction from highest to lowest is as follows: falls, struck by objects, electrocution, and caught-in/between. these four are collectively known as fatal four.

in the case of falls, the type that is responsible for the overall highest death in the category is falls from roofs.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.