How does the method of substitution work?

Step-by-step explanation:

The method of solving "by substitution" works by solving one of the equations (you choose which one) for one of the variables (you choose which one), and then plugging this back into the other equation, "substituting" for the chosen variable and solving for the other. Then you back-solve for the first variable.

Look at https://www.purplemath.com/modules/systlin4.htm#:~:text=The%20method%20of%20solving%20%22by,solve%20for%20the%20first%20variable. for more information

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.

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.