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pav-90 [236]
3 years ago
11

.5n-9=4n+5 pls i need help

Mathematics
1 answer:
Oksana_A [137]3 years ago
3 0
Hi there,

5n - 9 + 4n + 5
5n - 4n = 5 + 9

Hence,   N = 14

Hope this helps :)
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Please help me find it i will give 20 pts
jolli1 [7]

Answer:

a) 23.5619449 m^2     b) 351.8583772 cm^2      c) 75.39822369 cm^2

Step-by-step explanation:

a):

SA = 2πr^2+2πr

r= 3/2 = 1.5

SA= 2π*1.5^2 + 2π*1.5

SA= 15/2 ∏

SA= 23.5619449 m^2 round it as you want

b): Same steps as "a" but rather than m^2 it is cm^2

the answer will be:

SA= 112π

SA= 351.8583772 cm^2  round it as you want

c): the radius is already given so just place it in place of r

SA= 2π*3^2 + 2π*3

SA= 24π

SA= 75.39822369 cm^2

5 0
2 years ago
Engineers at a large automobile manufacturing company are trying to decide whether to purchase brand A or brand B tires for the
andre [41]

Answer:

s_p =\sqrt{\frac{(12 -1)(5100)^2 +(12-1)(5900)^2}{12 +12 -2}}=5514.526

t=\frac{(37900-39800)-0}{5514.526\sqrt{\frac{1}{12}+\frac{1}{12}}}}=-0.844  

p_v =2*P(t_{22}  

Comparing the p value with a significance level for example \alpha=0.1 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can conclude that the true means are not significantly different.  

Step-by-step explanation:

Data given and notation

\bar X_{A}=37900 represent the mean for A

\bar X_{B}=39800 represent the mean for B

s_{A}=5110 represent the sample standard deviation for A

s_{B}=5900 represent the sample standard deviation for B

n_{A}=12 sample size for the group A  

n_{B}=12 sample size for the group B

\alpha Significance level provided  

t would represent the statistic (variable of interest)  

Concepts and formulas to use  

We need to conduct a hypothesis in order to check if the means are equal or not, the system of  hypothesis would be:  

Null hypothesis:\mu_{A}-\mu_{B}= 0  

Alternative hypothesis:\mu_{A} - \mu_{B}\neq 0  

We don't have the population standard deviation's but we assume that the population deviation is equal for both populations, so we can apply a t test to compare means, and the statistic is given by:  

t=\frac{(\bar X_{A}-\bar X_{B})-\Delta}{s_p\sqrt{\frac{1}{n_{A}}+\frac{1}{n_{B}}}} (1)  

Where s_p represent the standard deviation pooled given by:

s_p =\sqrt{\frac{(n_A -1)s^2_A +(n_B -1)s^2_B}{n_A +n_B -2}}

s_p =\sqrt{\frac{(12 -1)(5100)^2 +(12-1)(5900)^2}{12 +12 -2}}=5514.526

t-test: Is used to compare group means. Is one of the most common tests and is used to determine whether the means of two groups are equal to each other.  

With the info given we can replace in formula (1) like this:  

t=\frac{(37900-39800)-0}{5514.526\sqrt{\frac{1}{12}+\frac{1}{12}}}}=-0.844  

P value  

We need to find first the degrees of freedom given by:

df=n_A +n_{B}-2=12+12-2=22

Since is a two tailed test the p value would be:  

p_v =2*P(t_{22}  

Comparing the p value with a significance level for example \alpha=0.1 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can conclude that the true means are not significantly different.  

6 0
3 years ago
A helium-filled balloon has a volume of 50.0 L at 25°C and 1.08 atm. What volume will it have at .855 atm and 10.0°C? Question 1
balu736 [363]

Answer:

60.0 L

Step-by-step explanation:

Ideal gas law:

PV = nRT

where P is absolute pressure,

V is volume,

n is number of moles,

R is gas constant,

and T is absolute temperature.

Since n and R don't change:

P₁V₁ / T₁ = P₂V₂ / T₂

(1.08 atm) (50.0 L) / (25 + 273.15 K) = (0.855 atm) V / (10 + 273.15 K)

V = 60.0 L

3 0
3 years ago
Tom bought 2 1/16 pounds of peanuts and 2.45 pounds of cashews. Which did he buy more of?Explain.
dangina [55]
2.45 pounds is more because that equals to a little over .40% more than 1/16 as a fraction which would be more over to the right making it a smaller digit
6 0
3 years ago
Sheila made 9 shots in the long distance competition for a total of 21 points. Some of her shots were worth 2 points and the res
Paladinen [302]

I don't know if you need the average but i did 21 divided by 9 and got 2.333

7 0
3 years ago
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