Answer:
Step-by-step explanation:
The position formula for this is actually
![s(t)=-16t^2+64](https://tex.z-dn.net/?f=s%28t%29%3D-16t%5E2%2B64)
It says, in not so may words, that the object was dropped under the influence of gravity from a height of 64 feet. When it hits, the ground, it will not be above ground at all anymore...it will be ON the ground and have a height of 0. Therefore, if we set the position function equal to 0 and solve for t, we are finding out how long it will take for the object to hit the ground.
and
and
and
t = 2
It takes 2 seconds for the object to hit the ground from 64 feet up.
A. 1/36.
There is a 1/6 chance of getting a letter. To get multiple you must multiply them together. 1/6 times 1/6 is 1/36
Answer:
Step-by-step explanation:
Since the life span of the battery pack is known to be Normally distributed, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = life spans of battery packs.
µ = mean life span
σ = standard deviation
From the information given,
µ = 250 hours
σ = 20 hours
The probability that a battery pack lasts longer than 260 hours. It is expressed as
P(x > 260) = 1 - P(x ≤ 260)
For x = 260
z = (260 - 250)/20 = 0.5
Looking at the normal distribution table, the probability corresponding to the z score is 0.69
The percentage of battery packs that lasts longer than 260 hours is
0.69 × 100 = 69%
190 is the answer
Step-by-step explanation:
after you said 230 started 211 completed the race and 14 gave up 211-14 is 197 so 197-5 is 193 and round of to the nearest 10 will be 190 so 190 is your answer