Answer:
![\huge\boxed{\text{P(not factor of 35) = } \frac{2}{3}}](https://tex.z-dn.net/?f=%5Chuge%5Cboxed%7B%5Ctext%7BP%28not%20factor%20of%2035%29%20%3D%20%7D%20%5Cfrac%7B2%7D%7B3%7D%7D)
Step-by-step explanation:
We can use basic probability to find the probability that this roll is not a factor of 35.
First off, we know that with a six sided die there are 6 possible things we can roll.
1, 2, 3, 4, 5, or 6
Now, what are the factors of 35? The factors of 35 will be any whole number that can be multiplied by another whole number to get 35.
- We know
, so two factors are 1 and 35. - We know
, so two factors are 5 and 7.
Therefore, the factors of 35 are 1, 5, 7, 35.
Both 5 and 7 are inside the range of 1-6. So the probability of rolling a side that's a factor of 35 will be
since there are two factors and 6 possible options.
This means, logically, there is a
chance of not rolling a factor of 35.
Hope this helped!
Answer:
The time taken for the flare to hit the ground is approximately 10.7 seconds.
Step-by-step explanation:
Given : Suppose a flare is shot from the top of a 120 foot building at a speed of 160 feet per second. The equation
models the h height at t seconds of the flare.
To find : How long will it take for the flare to hit the ground?
Solution :
The equation
models the h height at t seconds of the flare.
The flare to hit the ground when h=0.
Substitute in the equation,
![-16t^2+ 160t + 120=0](https://tex.z-dn.net/?f=-16t%5E2%2B%20160t%20%2B%20120%3D0)
Applying quadratic formula, ![x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-b%5Cpm%5Csqrt%7Bb%5E2-4ac%7D%7D%7B2a%7D)
Where, a=-16, b=160 and c=120
![x=\frac{-160\pm\sqrt{160^2-4(-16)(120)}}{2(-16)}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-160%5Cpm%5Csqrt%7B160%5E2-4%28-16%29%28120%29%7D%7D%7B2%28-16%29%7D)
![x=\frac{-160\pm\sqrt{33280}}{-32}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-160%5Cpm%5Csqrt%7B33280%7D%7D%7B-32%7D)
![x=\frac{-160\pm 182.42}{-32}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-160%5Cpm%20182.42%7D%7B-32%7D)
![x=\frac{-160+182.42}{-32},\frac{-160-182.42}{-32}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-160%2B182.42%7D%7B-32%7D%2C%5Cfrac%7B-160-182.42%7D%7B-32%7D)
![x=−0.70,10.70](https://tex.z-dn.net/?f=x%3D%E2%88%920.70%2C10.70)
Reject the negative value.
Therefore, the time taken for the flare to hit the ground is approximately 10.7 seconds.
The ground, the building, and the ladder form a right triangle, in which
the leaning ladder is the hypotenuse.
For the angle between the ladder and the ground, the 4-ft along the ground
is the side adjacent to the angle, and the 7-ft ladder is the hypotenuse.
(adjacent side) / (hypotenuse) = cosine of the angle.
Cosine(a) = 4/7 = 0.57143... (rounded)
Angle 'a' = <em>55.15 degrees</em> (rounded)
Poop
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