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maw [93]
3 years ago
7

Ruben bought 6 new books for his collection. This increased his collection by 12%. How many books did he have before his purchas

es.
Mathematics
1 answer:
Olin [163]3 years ago
6 0
Hi, so first u have to multiple 12×6=72 then next u divide by 2 which must five u a food start
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Please help me<br><br> I don’t understand it
Anna35 [415]

Answer:

D

Step-by-step explanation:

The solution is B. In each equation, it uses parenthesis to group operations. On the left, each pair repeats one number either 1.6 and 4.2. On the right is written the reduced form by writing the expression with a greatest common factor.

Option A is incorrect since 1.6 is not the GCF which appears in each parenthesis.

Option B is incorrect because the operation in the parenthesis is multiplication and not addition.

Option C is incorrect because 1.6 as a GCF is applied using multiplication.

Option D is correct since 1.6 does occur as a GCF in each parenthesis. It also has written correctly (4.2 +7) since addition is the operation between the parenthesis.

8 0
4 years ago
A national survey of companies included a question that asked whether the customers like the new flavor of a cola from company A
mote1985 [20]

Answer:

The 98% confidence interval on the population proportion of people who like the new flavor is (0.8237, 0.8763).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 1000, \pi = \frac{850}{1000} = 0.85

98% confidence level

So \alpha = 0.02, z is the value of Z that has a pvalue of 1 - \frac{0.02}{2} = 0.99, so Z = 2.327.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.85 - 2.327\sqrt{\frac{0.85*0.15}{1000}} = 0.8237

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.85 + 2.327\sqrt{\frac{0.85*0.15}{1000}} = 0.8763

The 98% confidence interval on the population proportion of people who like the new flavor is (0.8237, 0.8763).

3 0
3 years ago
The degree of the polynomial function f(x) is 4. The roots of the equation f(x) =0 are -2,-1,1 and 3. Which graph could be the g
In-s [12.5K]

Answer:

top right

Step-by-step explanation:

roots of an equation = x-intercepts

7 0
3 years ago
Read 2 more answers
Mr. Paras sold a portion of his lot to his friend. The lot was 65 meters long and 32 meters
enot [183]

Answer:

1. What is the area of the lot that he supposed to sell?

  • 65*32 = 2080 sq. m

2. What was the area of the donated lot for the right of way?

  • 21*3 = 63 sq. m

3. What was the area of the remaining lot that was actually sold?

  • 2080 - 63 = 2017 sq. m
5 0
3 years ago
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What is 10.4 as a mixed number
svet-max [94.6K]
10 2/5 is the answer
4 0
3 years ago
Read 2 more answers
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