see the attached figure to better understand the problem
we know that
The equilateral triangle has three equal sides
so
in the equilateral triangle ABC

the height of the triangle is the segment BD
in the right triangle BCD
Applying the Pythagorean Theorem

solve for BD

substitute the values



therefore
<u>the answer is</u>
the height of the triangle is 
45+x=y 45 minutes to get ready plus x time spending getting dressed equals y (the total time to get ready for school)
C. Region D
Step-by-step explanation:
Just plug the equations into desmos the calculator will graph it and show you with colors where the solution is.
Answer:
(4x - 2)(x^2 + 5x)
4x^3 + 20x^2 - 2x^2 - 10x
4x^3 + 18x^2 - 10x
Step-by-step explanation: