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Yakvenalex [24]
3 years ago
5

PLEASE HELP ME ASAP ITS DUE AT MIDNIGHT AND I DONT HAVE A LOT OF TIME

Mathematics
2 answers:
Ne4ueva [31]3 years ago
4 0

Answer:

C

Step-by-step explanation:

Marrrta [24]3 years ago
3 0

Answer:

3.75

Step-by-step explanation:

21/8/7/2

=4/5*5

=3.75

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Which inequality represents this sentence? Seven times six is less than or equal to nine times five.
Amiraneli [1.4K]

the answer is D

I hope this helps

4 0
4 years ago
I need help with a question
zzz [600]

Answer:

5x^2+9x+3

Step-by-step explanation:

We just need to add like terms together

11x^2-6x^2=5x^2

5x+4x=9x

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6 0
3 years ago
The ratio of boys to girls in a class is 3:1. There are 36 students in the class. How many students are boys?
Georgia [21]

Answer:

27

Step-by-step explanation:

Let's call boys and girls 3x and x respectively. Since 3x + x = 36, x = 9. Boys = 3x = 3 * 9 = 27.

4 0
3 years ago
Read 2 more answers
The percentage of titanium in an alloy used in aerospace castings is measured in 51 randomly selected parts. The sample standard
luda_lava [24]

Answer: 0.3849

Step-by-step explanation:

Given : sample size : n= 51

sample standard deviation : s= 0.46

Significance level : \alpha=1-0.95=0.05

Using chi-square distribution, the critical values will be :

\chi^2_{\alpha/2, n-1}=\chi_{0.025,\ 50}=71.4202

\chi^2_{1-\alpha/2, n-1}=\chi_{0.975,\ 50}=32.3574

Confidence interval for population standard deviation (\sigma) :

\sqrt{\dfrac{s^2(n-1)}{\chi^2_{\alpha/2}}}

Substitute all the values , we get

\sqrt{\dfrac{(0.46)^2(50)}{71.4202}}

Hence, the 95% two-sided confidence interval for σ : 0.3849

8 0
3 years ago
Brittany had 7 rolls of quarters and four extra quarters. She use the equation n = 7q + 4 to n, the number of quarter she had al
frosja888 [35]
She would use n-4=7q to find how many quarters in each roll.
5 0
4 years ago
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