L=w+4m
A=w*l
A=w(w+4)=45
w^2+4w-45=0
w^2+9w-5w-45=0
w(w+9)-5(w+9)=0
(w+9)(w-5)=0
⇒ w+9=0 or w-5=0
⇒w-5=0
w=5
l=5+4
l=9
The answer is B
As the question states that you need to "subtract 4 from 12" that means that you are taking 4 away from 12, so it would be 12-4.
Then it says to divide by 8. This means that for the subtraction to happen first, it must be withing parenthesis, so that would make the expression become
(12-4)÷8
5 I guess I don't know if it's the right answer
Answer:
8.2
Step-by-step explanation:
Area of triangle is calculated by multiplying height to the base and that divided by two
20 × h ÷ 2 = 56^2
h = 5.6
The square length of CD is equal to sum of square length of height and base
6^2 + 5.6^2 = CD^2
CD = 8.2
