The diagram below shows a city block and each rectangle represents a different building. The shaded buildings have acceptable fire prevention
systems installed. Recently the city council passed a law mandating that
at least 80% of the buildings in each city block must have acceptable fire
prevention systems installed. Note: Upgrading part of a building does not
count. The entire building must have an acceptable fire prevention system.

a. How many of the buildings with unacceptable fire prevention must be
improved for this block to be in compliance with the new law?

b. This block must have a minimum % increase in buildings with
acceptable fire prevention systems in order to be in compliance with the law.
9:00pm

**Assume that each rectangle in the figure is the same size.

i dont know sorry

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.

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct

thus, the first answer choice, y = sec x, is the correct one