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Finger [1]
3 years ago
10

If an object is dropped from a height of 144 feet, the function gives the height of the object after t seconds. When will the ob

ject hit the ground?
Mathematics
1 answer:
IgorC [24]3 years ago
7 0
A=-32  (acceleration is the constant g)  integrating with respect to t

v=-32t+vi  but initial velocity is equal to zero as it is just "dropped".

h=-32t^2/2+hi, since the initial height is 144 ft

h(t)=-16t^2+144

The object will be at the ground when h(t)=0

-16t^2+144

-16(t^2-9)=0  

-16(t+3)(t-3)=0, but since we know t>0

t=3 seconds.
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The variance of a stock's returns can be calculated as the:
Tamiku [17]

Answer:

The correct option is b.

Step-by-step explanation:

The formula for standard deviation is

\sigma^2=\frac{\sum {(x-\overline{x})^2}}{n}

where, \overline{x} is mean of the data and n is number of observation.

The variance of a stock's returns can be calculated by the above formula.

Variance of stock's returns is the average value of squared deviations from the mean.

Therefore the correct option is b.

4 0
4 years ago
Pleaseeee i need help asap
Gekata [30.6K]
That's just too bad. I don't the answer. I'm just doing this to get points. Good luck.
5 0
3 years ago
Please help ASAP 40 PTS
umka21 [38]

Answer:

70

Step-by-step explanation:

The angle not marked in the top triangle is 40 degrees since it is an isosceles triangle.  That makes the angle opposite it in the other triangle 40 degrees since they are vertical angles and vertical angles are equal.

The bottom triangle has 3 angles that sum to 180 degrees,  The other angle not marked is also y since it is an isosceles triangle.

40 + y +y = 180

Subtract 40 from each side and combine like terms

40-40 +2y = 180-40

2y = 140

Divide by 2

2y/2 = 140/2

y = 70

3 0
3 years ago
Read 2 more answers
X-5+x-11=100 what is the reason for this statement for geometry?​
Mariulka [41]

Answer:

because when the value of x is replaced in the factorisation it Will be equivalent to 100

3 0
3 years ago
Plz help me with #23 and #41
GuDViN [60]
23) 17/30

41) 3/10 because 3/10 + 7/10 = 10/10 or 1.
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