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what is a necessary step for constructing perpendicular lines through a point on a line?

draw a line that intersects the first line at an acute angle using a straightedge.
draw a ray that intersects the first line at an acute angle using a straightedge.
draw arcs on either side of a given point on the line.
draw arcs on either side of a given point off the line.

a

Step-by-step explanation:

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %

b