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Llana [10]
3 years ago
7

The sum of twice a number and seven

Mathematics
1 answer:
sergejj [24]3 years ago
7 0

Answer:

2x+7

Step-by-step explanation:

The word sum indicates addition.

Twice a number is 2x

and 7 is plus 7

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Gretchen can buy 17.4 ounces of Brand A toothpaste for $5.22, or she can buy 26.6 ounces of Brand B toothpaste for $6.65. Which
konstantin123 [22]
Price of Brand A toothpaste for 17.4 ounces = <span>$5.22
</span>Price of Brand A toothpaste for 1 ounce = $5.22/17.4 = 0.3
Price of Brand B toothpaste for 26.6 ounces = $6.65
Price of Brand B toothpaste for 1 ounces = $6.65/26.6 = 0.25
So, if we see the price for per ounce of brand A and B, price of Brand B per ounce is less than brand A.
and if we find the difference between the prices of both = 0.3 - 0.25 = 0.05

Thus, the correct answer is "D", <span>Brand B is the better deal, because it costs $0.05 less per ounce than Brand A".</span>
3 0
3 years ago
Read 2 more answers
The mean of a set of credit scores is Mu = 690 and sigma = 14. Which credit score is within a z-score of 3.3? 634 640 720 750
xz_007 [3.2K]

Answer:

720

Step-by-step explanation:

To solve this question, we would be using the formula for z- score

The formula for calculating a z-score is z = (x-μ)/σ

where x = raw score

μ = population mean

σ = sigma = population standard deviation.

From the question, we are given

The mean of a set of credit scores Mu = 690

sigma = population standard deviation 14

z - score = 3.3

This means we are to find x

z = (x-μ)/σ

3.3 = x - 690/ 14

Cross Multiply

3.3 × 14 = x - 690

46.2 = x - 690

x = 690 + 46.2

x = 736.2

Since we are told that it is a range, the closest out of the options given to our calculated x which is 736.2 is 720

8 0
4 years ago
Read 2 more answers
X + 3 - 3 = -6 <br> Pls help it makes no sense
Lesechka [4]

Answer:

<h2><u><em>x = -6</em></u></h2>

Step-by-step explanation:

<u><em>x + 3 - 3 = -6</em></u>                    (3 - 3 = 0)

<u><em>x = -6</em></u>

-------------

check

-6 + 3 - 3 = -6

- 6 = - 6

the answer is good

6 0
2 years ago
The midpoint of the points (5, 5) and (-1, 3) is:<br> (2.4)<br> (4,8)<br> (5, 1)<br> (3, 4)
Sergeu [11.5K]

Answer:

Step-by-step explanation:

(5 - 1)/2= 4/2 = 2

(5+3)/2= 8/2= 4

(2,4)

5 0
3 years ago
I need help me explain the answer
Slav-nsk [51]
108 is the answer because a triangle has a total of 180 degrees and you only have 72 so far basically add 36+36 or 36*2 then since you have 72 subtract it from 180 and thats your answer 
5 0
4 years ago
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