Answer: b/a = -8
Step-by-step explanation:
When we have a quadratic equation:
y = a*x^2 + b*x + c.
The vertex of this function (and the axis of symetry) is located at:
x = -b/2a
Now, we know that the axis of symmetry is at x = 4.
then we have:
4 = -b/2a
And we want to find b/a.
Then we start with:
-b/2a = 4.
first we multiply by 2 in each side:
2*(-b/2a) = -b/a = 2*4 = 8.
now we multiply by -1 in each side:
-1*(-b/a) = b/a = -1*8.
Then we have: b/a = -8
Answer:
sorry but I don't understand
Step-by-step explanation:
please forgive me
comment if I am forgiven
Answer:
ZD = 10
Step-by-step explanation:
In a parallelogram
- Every two opposite sides are parallel
- Every two opposite sides are equal
- Every two opposite angles are equal
- Every two adjacent angles are supplementary
- The two diagonals bisect each other (meet each other at their midpoint)
Let us solve the question
∵ ABCD is a parallelogram
∵ AC and DB are its diagonals
→ By using the 5th property above
∴ AC and BD bisect each other
∵ AC ∩ BD at point Z
→ That means Z is the midpoint of them
∴ Z is the midpoint of BD
→ That means Z divides BD into 2 equal parts BZ and ZD
∴ BZ = ZD
∵ BZ = 10
∴ ZD = 10
Answer:
C.)
Step-by-step explanation:
cut the shape into a square and a triangle, find their area's and add. ^_^