Answer:
3.81 s
Step-by-step explanation:
Let's consider the following formula that represents the journey of a falling object.
d = 3 t + 5 t²
where,
- d is the distance measured in feet
- t is the time measured in seconds
We can find the time that it will take to travel 84 feet by replacing d = 84 in the equation.
84 = 3 t + 5 t²
5 t² + 3 t - 84 = 0
We have a = 5, b = 3 and c = -84. We apply the second grade solving formula.
x₁ = 3.81 and x₂ = -4.41
Since the time cannot be negative, the answer is t = 3.81 s
Answer:
where's the picture?
Step-by-step explanation:
Answer:
Round to nearest 10
Step-by-step explanation:
We are going to use a continuity correction factor. When you use a normal distribution to get the estimated binomial distribution, you're going to have to use a continuity correction factor. So with this, the data will become from <span>20 - 35 it will now become 19.5 to 35.5.
So we are going to use the z table for this problem. So if we are looking for the z value, the formula would be: </span>x – μ / σ<span>
get the value of the first z value:
</span>z1 = (19.5 - 30) / 9 = -1.167
get the value of the second z value:
<span>z2 = (35.5 - 30) / 9 = 0.61
</span>
So getting the probability of both:
P(-1.167 < z < 0.61) = P(Z ≤ b) – P(Z ≤ a) = <span>0.6075</span>
Answer:
16.80 ft long
Step-by-step explanation: