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torisob [31]
3 years ago
15

The end of a hose was resting on the ground, pointing up an angle. Sal measured the path of the water coming out of the hose and

found that it could be modeled using the equation f(x) = –0.3x2 + 2x, where f(x) is the height of the path of the water above the ground, in feet, and x is the horizontal distance of the path of the water from the end of the hose, in feet.
When the water was 4 feet from the end of the hose, what was its height above the ground?

A. 3.2 feet
B. 4.8 feet
C. 5.6 feet
D. 6.8 feet

Mathematics
2 answers:
Kazeer [188]3 years ago
6 0
The problem above can be modelled as shown in the graph below

At x=4, the height of the water from the ground is
f(4)=-0.3 (4)^{2} +2(4)
f(4)=3.2 ft

Feliz [49]3 years ago
4 0

Answer:

The answer is 3.2

Step-by-step explanation:

I can't explain it very well but A is the answer.

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An engineer is comparing voltages for two types of batteries (K and Q) using a sample of 75 type K batteries and a sample of 46
lorasvet [3.4K]

The decision rule for rejecting the null hypothesis, considering the t-distribution, is of:

  • |t| < 1.9801 -> do not reject the null hypothesis.
  • |t| > 1.9801 -> reject the null hypothesis.

<h3>What are the hypothesis tested?</h3>

At the null hypothesis, it is tested if there is not enough evidence to conclude that the mean voltage for these two types of batteries is different, that is, the subtraction of the sample means is of zero, hence:

H_0: \mu_1 - \mu_2 = 0

At the alternative hypothesis, it is tested if there is enough evidence to conclude that the mean voltage for these two types of batteries is different, that is, the subtraction of the sample means different of zero, hence:

H_1: \mu_1 - \mu_2 \neq 0

We have a two-tailed test, as we are testing if the mean is different of a value.

Considering the significance level of 0.05, with 75 + 46 - 2 = 119 df, the critical value for the test is given as follows:

|t| = 1.9801.

Hence the decision rule is:

  • |t| < 1.9801 -> do not reject the null hypothesis.
  • |t| > 1.9801 -> reject the null hypothesis.

More can be learned about the t-distribution in the test of an hypothesis at brainly.com/question/13873630

#SPJ1

3 0
1 year ago
Jenny is making a quilt from the pattern blocks shown below.
denis23 [38]

Answer:

A

Step-by-step explanation:

7 0
3 years ago
Question 5 (1 point)
Bess [88]

Answer:

x > -3

Step-by-step explanation:

-3x + 6 < 15

-3x < 15 - 6

-3x < 9

-x < 3

x > -3

3 0
3 years ago
Read 2 more answers
1. What is the range? Write your answer like #<br> Helppppppp
Korolek [52]
I don’t know sorry but like how’s yoonbum doing? Also like wanna be friends?
4 0
3 years ago
Round 232.76 to 2 significant figures
lana [24]
So sig figs are non zero so

500 has 1 sig fig, 5
but 500. has 3 sig figs because it has a decimal

2.3 has 2 sig figs
2.03 has 3 sig figs so to make 232.76 to 2 sig figs you would put it into scientific notation and get 2.3 times 10^2 and thats 2 sig figs (the 10^2 doesn't count as a sig fig)
5 0
3 years ago
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