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Irina-Kira [14]
3 years ago
11

Please i need help!

Mathematics
1 answer:
Naddik [55]3 years ago
6 0

A.

Hope this helps :)

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Joe practiced his trumpet 3/4 hour on Monday and 7/12 hour on Tuesday. How long did he practice altogether
Allisa [31]
1 1/3 hours. 3/4 plus 7/12 equals 1 1/3. Hope this helps
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4 years ago
Milk cartons come in crates of 24. how many crates does a school need to order to serve to 400 students
krok68 [10]

divide 400 by 24

400 / 24 = 16.666

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3 years ago
What is an equation of a parabola with vertex at the origin and focus (0, 7)
MakcuM [25]
<h3>Answer: B)  y = (1/28)x^2</h3>

Explanation:

p = focal distance = 7

the focal distance is from the vertex to the focus

The parabola opens upward (since the vertex is below the focus) so 'a' is positive and a = 1/(4p) = 1/(4*7) = 1/28

The vertex is (h,k) = (0,0)

Put this all together into the formula below and simplify

y = a(x-h)^2 + k

y = (1/28)(x - 0)^2 + 0

y = (1/28)x^2

8 0
4 years ago
The mean income per person in the United States is $50,000, and the distribution of incomes follows a normal distribution. A ran
sergij07 [2.7K]

Answer:

Yes. There is sufficient eveidence to support  the claim that Wilmington resident's earn more than the national average

Step-by-step explanation:

Given the following;

\alpha=Significance \ Level=0.05\\n=10\\\bar X=60000\\\ s=sample\  \sigma=10000

#We set our hypothesis as:

H_o:\mu\leq 50000\\H_a:\mu>50000

The rejection region of either hypothesis:

P(t>t_o)=0.05, we determine the critical values for this probability in the T distribution table;

t=1.833

=>We reject for all values greater than 1.833, t>1.833.

#We now determine the value of the test statistic as:

t=\frac{\bar X-\mu_o}{s/\sqrt{n}}\\\\=\frac{60000-50000}{10000/\sqrt{10}}\\\\=3.1623

We find that:

t=3.1623>1.833,\ \ \ Reject \ H_o

Hence, there is sufficient eveidence to support  the claim that Wilmington resident's earn more than the national average.

4 0
3 years ago
I WILL MARK BRAINEST!! number 6 please!! i really need help thank you!
zhenek [66]

Answer:

((8-2t)x3t)-(3-txt)

Step-by-step explanation:

srry just guessing

5 0
3 years ago
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