SAT question Can someone explain to me what this is asking
1 answer:
Answer:
B
Step-by-step explanation:
The vertex is the turning point of the parabola.
First find the zeros by equating y to zero, that is
(x - 6)(x + 12) = 0
Equate each factor to zero and solve for x
x - 6 = 0 ⇒ x = 6
x + 12 = 0 ⇒ x = - 12
The vertex lies on the axis of symmetry which is situated at the midpoint of the zeros, thus
=
=
= - 3
Thus the x- coordinate of the vertex is x = - 3 → B
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Answer:
The ratio of the radius of circle Q to the radius of circle R is
Step-by-step explanation:
step 1
Find the scale factor
we know that
If two figures are similar, then the ratio of its areas is equal to the scale factor squared
In this problem
Let
z-----> the scale factor
x-----> the area of circle Q's sector
y-----> the area of circle R's sector
so
substitute
square root both sides
------> scale factor
step 2
Find the the ratio of the radius of circle Q to the radius of circle R
we know that
If two figures are similar, then the ratio of its corresponding sides is equal to the scale factor
In this problem
The ratio of its corresponding radius is equal to the scale factor
so
Let
z------> the scale factor
x-----> the radius of circle Q
y-----> the radius of circle R
so
therefore
Answer:
Step-by-step explanation:
→ Remember multiplication occurs first
→ Simplify the remaining expression