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Akimi4 [234]
2 years ago
15

Which trig function would you use?

Mathematics
2 answers:
Vinil7 [7]2 years ago
8 0

Answer:

tangent.

Step-by-step explanation:

with reference angle 43°

perpendicular (p) = a

base (b) = 11

So here we use

tangent = p / b

Hope it will help :)

vovikov84 [41]2 years ago
7 0
I did not think was doing a good job
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A ball is thrown into the air with an upward velocity of 80ft/s. Its height H in feet after T seconds id given by the function H
pashok25 [27]
1. The function H= -16T^2+80T+5 is a parabola of the form a x^{2} +bx+c, so to find the maximum height of the ball, we are going to find the y-coordinate of the vertex of the parabola. To find the y-coordinate of the vertex we are going to evaluate the function at the point \frac{-b}{2a}.
From our function we can infer that b=80 and a=-16, so the point \frac{-b}{2a} [/tex] will be \frac{-80}{-2(16)} = \frac{5}{2}. Lets evaluate the function at that point:
h=-16t^2+80t+5
h=-16( \frac{5}{2} )^2+80( \frac{5}{2} )+5
h=105

We can conclude that the ball reaches a maximum height of 105 feet.

2. Since we now know that the maximum height the ball reaches is 105 feet, we are going to replace h with 105 in our function, then we are going to solve for t to find how long the ball takes to reach its maximum height:
h=-16t^2+80t+5
105=-16t^{2}+80t+5
-16t^2+80t-100=0
-4(4t^{2}+20t-25)=0
4(2t-5)^2=0
2t-5=0
t= \frac{5}{2}
t=2.5

We can conclude that the ball reaches its maximum height in 2.5 seconds.

3. Just like before, we are going to replace h with 5 in our original function, then we are going to solve for t to find how long will take for the ball to be caught 5 feet off the ground:
h=-16t^2+80t+5
5=-16t^2+80t+5
-16t^{2}+80t=0
-16t(t-5)=0
t-5=0
t=5

We can conclude that it takes 5 seconds for the ball to be caught 5 feet off the ground.
5 0
3 years ago
Kaitlyn was asked to find which expression below is equivalent to -3x + 5(x + 2)?
NISA [10]
The correct answer is c (2x+10)
I think her error was that she multiplied he numbers wrong
4 0
2 years ago
Read 2 more answers
A survey organization has used the methods of our class to construct an approximate 95% confidence interval for the mean annual
lawyer [7]

Answer:

\bar X = \frac{66000+70000}{2}= 68000

We can estimate the margin of error with this formula:

ME= \frac{Upper -Lower}{2}= \frac{70000-66000}{2}= 2000

And the margin of error is given by:

ME = z_{\alpha/2}\frac{\sigma}{\sqrt{n}}

And we can rewrite the margin of error like this:

ME =z_{\alpha/2}*SE

Where SE= \frac{\sigma}{\sqrt{n}}

For 95% of confidence the critical value is z_{\alpha/2}= \pm 1.96

The Standard error would be:

SE= \frac{ME}{z_{\alpha/2}}= \frac{2000}{1.96}= 1020.408

For 99% of confidence the critical value is z_{\alpha/2}= \pm 2.58

And the new margin of error would be:

ME = 2.58* 1020.408 = 2632.653

And then the interval would be given by:

Lower = 68000- 2632.653 = 65367.347

Upper = 68000+ 2632.653 = 70632.653

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)

The 95% confidence interval is given by (66000 , 70000)

We can estimate the mean with this formula:

\bar X = \frac{66000+70000}{2}= 68000

We can estimate the margin of error with this formula:

ME= \frac{Upper -Lower}{2}= \frac{70000-66000}{2}= 2000

And the margin of error is given by:

ME = z_{\alpha/2}\frac{\sigma}{\sqrt{n}}

And we can rewrite the margin of error like this:

ME =z_{\alpha/2}*SE

Where SE= \frac{\sigma}{\sqrt{n}}

For 95% of confidence the critical value is z_{\alpha/2}= \pm 1.96

The Standard error would be:

SE= \frac{ME}{z_{\alpha/2}}= \frac{2000}{1.96}= 1020.408

For 99% of confidence the critical value is z_{\alpha/2}= \pm 2.58

And the new margin of error would be:

ME = 2.58* 1020.408 = 2632.653

And then the interval would be given by:

Lower = 68000- 2632.653 = 65367.347

Upper = 68000+ 2632.653 = 70632.653

7 0
3 years ago
2 times 2 plus 10 plus 200 plus 56
serious [3.7K]
2×2 + 10 + 200 + 56
The order of operations requires the multiplication be done first.
= 4 + 10 + 200 + 56
The addition is done left to right.
= 14 + 200 + 56
= 214 + 56
= 270
5 0
3 years ago
Read 2 more answers
Which statement is an example of the Reflexive Property of Equality?
mafiozo [28]
Reflexive pretty much means something relating to itself. The reflexive property of equality simply states that a value is equal to itself. Further, this property states that for all real numbers, so your answer will be (A) x = x.
6 0
2 years ago
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