perimeter means to add up all the number around a surface so you are correct the answer is 12 because you are suppose to add up everything around the object so 7+5 which gives you 12
ANSWER
Area of triangle = b*h/2
24*20/2
24*10
The area of this triangle is 240 ft squared
Hope it helps :)
x- coordinate of vertex = - 3
the vertex lies on the axis of symmetry , which is positioned at the midpoint of the zeros
find the zeros by setting y = 0
(x - 6)(x + 12) = 0 ( equate each factor to zero and solve for x )
x - 6 = 0 ⇒ x = 6
x + 12 = 0 ⇒ x = - 12
x coordinate of vertex = 
= 
= - 3
You could compute it based on the given information as (-20)(3). The next best choice is ...
A: (4)(-5)(3)
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There is nothing in the problem statement that specfically says after 4 stops she checks her instruments. You have to figure that from -20/-5. That is why I would skip that step and go directly to (-20)(3).
Multiply 2/3 by 6 to find the revolutions in one minute.
2/3 * 6 = 4
Multiply 4 by 60 to find the revolutions per minute.
4 * 60 = 240
240 Revolutions per minute.
