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Darina [25.2K]
3 years ago
5

Printer A in the copy room can make 50 copies in 3 minutes. Printer B takes 6 minutes to make 80 copies. Which printer has a fas

ter printing rate per minute? By how many minutes is that printer
faster Write your answer as a fraction.

I need help quick please
Mathematics
1 answer:
OverLord2011 [107]3 years ago
4 0

Answer:

b

Step-by-step explanation:

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20 pts and a mark!!! A store is having a sale on jelly beans and trail mix. For 6 pounds of jelly beans and 2 pounds of trail mi
marysya [2.9K]

Answer:

The cost of Jelly Beans = $ \frac{5}{4} $

The cost of Trail Mix      = $ \frac{9}{4} $

Step-by-step explanation:

Given the cost of 6 pounds of Jelly Beans and 2 pounds of trail mix is $12.

Also, the cost of 3 pounds of Jelly Beans and 5 pounds of Trail mix is $15.

Call the cost of one pound of Jelly beans as J

And cost of one pound of Trail Mix as T.

Now, converting the given data to mathematical form, we would have:

$ 6J + 2T = 12  $

Dividing through out by 2 we have:

$ 3J + T = 6 \hspace{15mm}  .....(1) $

$ 3J + 5T = 15 \hspace{15mm} ....(2) $

To solve (1) and (2), subtract the two equations which will give us:

$ -4T = - 9 $

⇒                                            T = 9/4

Substituting the value of T in (1), we have:

$ 3J = 6 - \frac{9}{4} $

$ \implies 3J = \frac{24 - 9}{4} = \frac{(3)(8 - 3)}{4} = \frac{5}{4} $

∴                                               J  = 5/4

5 0
3 years ago
To express the polynomial 6p^2+2p^3-p^4+3 in standard form, which term should be written first?
Fed [463]
-p^4, as it is your highest exponent value.
6 0
4 years ago
Read 2 more answers
A recent study focused on the amount of money single men and women save monthly. The information is summarized here. Assume that
beks73 [17]

Answer:

t=\frac{(23 -28)-(0)}{8.126\sqrt{\frac{1}{25}+\frac{1}{30}}}=-2.272

p_v =2*P(t_{53}

If we compare the p value obtained and using the significance level assumed \alpha=0.01 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis that the means are equal between the two groups at this significance level.    

Step-by-step explanation:

When we have two independent samples from two normal distributions with equal variances we are assuming that  

\sigma^2_1 =\sigma^2_2 =\sigma^2

And the statistic is given by this formula:

t=\frac{(\bar X_1 -\bar X_2)-(\mu_{1}-\mu_2)}{S_p\sqrt{\frac{1}{n_1}+\frac{1}{n_2}}}

Where t follows a t distribution with n_1+n_2 -2 degrees of freedom and the pooled variance S^2_p is given by this formula:

\S^2_p =\frac{(n_1-1)S^2_1 +(n_2 -1)S^2_2}{n_1 +n_2 -2}

This last one is an unbiased estimator of the common variance \sigma^2

The system of hypothesis on this case are:

Null hypothesis: \mu_1 = \mu_2

Alternative hypothesis: \mu_1 \neq \mu_2

Or equivalently:

Null hypothesis: \mu_1 - \mu_2 = 0

Alternative hypothesis: \mu_1 -\mu_2 \neq 0

Our notation on this case :

n_1 =25 represent the sample size for men

n_2 =30 represent the sample size for women

\bar X_1 =23 represent the sample mean for men

\bar X_2 =28 represent the sample mean for the women

\sigma_1=5 represent the population standard deviation for men

\sigma_2=10 represent the population standard deviation for women

First we can begin finding the pooled variance:

\S^2_p =\frac{(25-1)(5)^2 +(30 -1)(10)^2}{25 +30 -2}=66.038

And the deviation would be just the square root of the variance:

S_p=8.126

And now we can calculate the statistic:

t=\frac{(23 -28)-(0)}{8.126\sqrt{\frac{1}{25}+\frac{1}{30}}}=-2.272

Now we can calculate the degrees of freedom given by:

df=25+30-2=53

And now we can calculate the p value using the altenative hypothesis:

p_v =2*P(t_{53}

If we compare the p value obtained and using the significance level assumed \alpha=0.01 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis that the means are equal between the two groups at this significance level.    

3 0
3 years ago
Two numbers have a difference of 0.85 and a sum of one. What are the numbers?
Dimas [21]
If you would like to know the numbers, you can calculate this using the following steps:

a - b = 0.85 ... a = 0.85 + b
a + b = 1
___________________________
a + b = 1
(0.85 + b) + b = 1
0.85 + 2 * b = 1
2 * b = 1 - 0.85
2 * b = 0.15     /2
b = 0.15 / 2
b = 0.075

a = 0.85 + b = 0.85 + 0.075 = 0.925

The correct result would be: 0.075 and 0.925.
7 0
3 years ago
Hkw do you solve 1/3(6x-9)=7-2x?
Westkost [7]
1/3(6x-9)=7-2x
2x-3=7-2x
2x+2x-3+3=7+3-2x+2x
4x=10
X=10/4
5 0
4 years ago
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