Have a quadratic like ax^2+bc+c=0
Then the maximum/minimum is when x = (-b)/2a
Responder:
3
Explicação passo a passo:
Dado :
Total de brinquedos:
Bonecas = 21
Carros Roy = 18
Figuras de ação = 15
Número total de brinquedos = (21 + 18 + 15) = 54 brinquedos
Número de brinquedos por prateleira = 18
Número de prateleiras:
Número total de brinquedos / número de brinquedos por prateleira
Número de prateleiras = 54/18
Número de prateleiras = 3
3 prateleiras estão na vitrine
Answer:
Part 1) The value of y=6
Part 2) ED=36, DB=36 and EB=72
Step-by-step explanation:
In this problem we know that
ED=DB -----> equation A
EB=ED+DB -----> equation B
The point D is the midpoint ED
see the attached figure to better understand the problem
step 1
Find the value of y
Substitute the given values in the equation A

solve for y



step 2
Find the value of ED,DB and EB

substitute the value of y

Remember that
ED=DB
therefore

Find the value of EB
EB=ED+DB

Apply the rules of sum/difference for trigonometric functions:


Multiply the two expressions:



You can factor
from the first and last term, and
from the two middle terms: you have

Since
, the identity is proven.