Determine the direction that this parabola opens y=x^2+2x+8up or down
1 answer:
Answer:
up
Step-by-step explanation:
The standard equation for a parabola is y = ax^2 + bx + c. If the coefficient a is positive, then the curve (graph) opens up.
In y=x^2+2x+8 this coefficient is +1, so the curve opens up.
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Step 1
Find the area of one equilateral triangle
Applying the law of sines

in this problem
a=b=7 cm
C=60 degrees
so

cm²
Step 2
To calculate the area of the hexagon multiply the area of one equilateral triangle by 
cm²
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the answer is the option
73.5 sqrt 3cm²
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Answer:
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Answer:
B
Step-by-step explanation:
Answer:
225/4
Step-by-step explanation:
x²– 15x – 23 = 0
To complete the square
We take to coefficient of the x term
-15
divide by 2
-15/2
Square it
225/4
Add it to each term