a = 4, b = -21, c = -18
to keep from getting "mixed up", evaluate the discriminant first ...
b<sup>2</sup> - 4ac = (-21)<sup>2</sup> - 4(4)(-18) = 729
sqrt(729) = 27
x = (21 +/- 27)/8
x = -3/4, x = 6
since the discriminant is a perfect square, the original quadratic will factor ...
4x<sup>2</sup> - 21x - 18 = 0
(4x + 3)(x - 6) = 0
x = -3/4, x = 6
Well, let's see. My main problem here is how to lay it out clearly for you.
-- Do you remember the definition of a 'radian' ? A radian is an angle, that's
just the right size to cut one radius-length arc out of the curve of the circle.
-- So every radian of spin moves the tip of the propeller a distance that's
equal to the radius of the circle.
-- Now the radius of the circle that the tip of the propeller traces
is the length of the propeller blade ... 22.5 cm .
-- 130 radians per second means the tip of the propeller is traveling
the length of the circle's radius 130 times a second.
-- (130) x (22.5 cm) = 2,925 centimeters/second = 29.25 meters/second.
Answer:
The answer is A
Step-by-step explanation:
Hopes this helps.
Answer:
you all have to divide by 2
Step-by-step explanation:
602.88÷2= 301.44