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UNO [17]
3 years ago
6

An object falls from a height of 400 feet. Its height, h, in feet is given by the equation h=-16t^2+400 , where t is the time in

seconds the object has fallen. How many seconds will it take for the object to reach the ground?
A.
1/5
B.
5
C.
20
D.
25
Mathematics
1 answer:
LekaFEV [45]3 years ago
6 0
16t^2=400
t^2=25
t=5
5 seconds=B
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Please please please please please please help me if u can tysmm
faltersainse [42]
Q55.
UTA+ATS=UTS
x+18+120=12x+17
x+138=12x+17
12x-x=138-17
11x=121
x=121/11
x=11

mUTA=x+18
put the value of x
11+18
mUTA=29

Q57.
AQP+RQA=RQP
9x+2+75=1+28x
9x+77=1+28x
28x-9x=77-1
19x=76
x=76/19
x=4

mRQP=1+28x
put the value of x
1+28(4)
1+112
mRQP=113
4 0
2 years ago
In one month Sierra earned $400 and $100 was withheld from income tax. Suppose she makes $600 next month. How much will be withh
valentina_108 [34]

Answer:

$150

Step-by-step explanation:

it is $25 income tax every $100 earned so 25 x 6 = 150

6 0
3 years ago
Need help please and thank you
mojhsa [17]

Answer:

(c) option

Step-by-step explanation:

A = 4pier²

A/4pie = r²

Under root (A/4pie) = r

(c) option

<em>Hope</em><em> </em><em>it</em><em> </em><em>helps</em><em>.</em>

3 0
2 years ago
A researcher has two percentages and wants to know if the percentages are statistically different. The researcher calculates the
love history [14]

Answer:

p_v =2*P(Z>4.21) =2.55x10^{-5}

And we can use the following excel code to find it:"=2*(1-NORM.DIST(4.21,0,1,TRUE)) "

With the p value obtained and using the significance level assumed for example\alpha=0.05 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the percentage 1 is significantly different from the percentage 2.

D) Are statistically different.

Step-by-step explanation:

The system of hypothesis on this case are:  

Null hypothesis: \mu_1 = \mu_2  

Alternative hypothesis: \mu_1 \neq \mu_2  

Or equivalently:  

Null hypothesis: \mu_1 - \mu_2 = 0  

Alternative hypothesis: \mu_1 -\mu_2\neq 0  

Where \mu_1 and \mu_2 represent the percentages that we want to test on this case.

The statistic calculated is on this case was Z=4.21. Since we are conducting a two tailed test the p value can be founded on this way.

p_v =2*P(Z>4.21) =2.55x10^{-5}

And we can use the following excel code to find it:"=2*(1-NORM.DIST(4.21,0,1,TRUE)) "

With the p value obtained and using the significance level assumed for example\alpha=0.05 we have p_v so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the percentage 1 is significantly different from the percentage 2.

And the best option on this case would be:

 D) Are statistically different.

4 0
3 years ago
What is the next term for the given arithmetic sequence? -3, -2.25, -1.5, -0.75, ...
KATRIN_1 [288]
The common difference is 0.75. Therefore the next term in the sequence is:
-0.75 + (0.75) = 0.
6 0
3 years ago
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