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sertanlavr [38]
3 years ago
8

urgent! i need an explanation please *picture included* also can someone make sure the second one is b or not?

Mathematics
1 answer:
Schach [20]3 years ago
6 0

Answer:

For the first one it is D.

Step-by-step explanation:

I added 84.6 and 30.4 which gives me 115. I then added 66 to get 181, triangles angles only add up to 180 degrees, therefore they are not similar.

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The mean of four numbers is 70. When a fifth number is included, the mean of the five numbers is 80. What is the fifth number?
Yakvenalex [24]
<h3>Answer: 120</h3>

=============================================

Explanation:

S = sum of the first four values

S/4 = 70 since we divide the sum by 4 to get the mean of the first four values

S = 280 is the result after multiplying both sides by 4

Let x be the fifth unknown value. Adding it onto S leads to S+x = 280+x. This represents the sum of all five values.

Dividing that sum 280+x over 5 leads to the new mean 80, which leads to...

----------

(280+x)/5 = 80

280+x = 5*80

x+280 = 400

x = 400-280

x = 120

The fifth number is 120

3 0
3 years ago
I really need help. Please answer as many as you can. I'm still figuring some out. Thanks!
Aliun [14]
Hey there, Simmonsalivia!

It seems that you are in a hurry so I will make it quick without explanation.
1) \frac{17}{4} or 4  \frac{1}{4}
2) \frac{20}{3} or 6  \frac{2}{3}
3) 11
4) \frac{56}{15} or 3 \frac{11}{15}
5) \frac{9}{8} or 1 \frac{1}{8}
6) \frac{35}{18} or 1  \frac{17}{18}
7) 4
8) \frac{49}{12} or 4  \frac{1}{12}
9) \frac{55}{6} or 9  \frac{1}{6}
10) 23 \frac{3}{4} tablespoons of ground coffee.
11) She used 10  \frac{3}{8} amount of flour in total.
12) \frac{16}{5} or 3  \frac{1}{5}
13) 4
14) \frac{47}{15} or 3  \frac{2}{15}
15) \frac{28}{3} or 9 \frac{1}{3}
16) \frac{68}{9} or 7 \frac{5}{9}
17) \frac{50}{9} or 5  \frac{5}{9}
18) \frac{11}{3} or 3  \frac{2}{3}
19) \frac{14}{5} or 2  \frac{4}{5}
20) \frac{16}{5} or 3  \frac{1}{5}
21) Ty needed 7 paving stones.
22) Besides the top block, they needed 25 blocks to build the tower.

Thank you for using Brainly.
See you soon!
3 0
3 years ago
Can you guys help me with this one?
svet-max [94.6K]
You can factor this by taking out the GCF (greatest common factor).

In the expression, the greatest common factor between the two terms is 5.

Take out 5:

5(2b + 5)

Is it possible to factor 2b + 5 even more?

No. So, your answer is D. 5(2b + 5).
6 0
3 years ago
[02.06]
Tresset [83]
-13>-5x+2>-28   subtract 2 from all expressions

-15>-5x>-30  divide each expression by -5 

Be sure to reverse direction of signs when you divide/multiply by a negative value!

3<x<6

So the "graph" will be a infinitely high plane, or area, contained between the two vertical lines x=3 and x=6
6 0
4 years ago
Read 2 more answers
How do I answer this question pls help me
n200080 [17]

Answer:

  14.7 quarts

Step-by-step explanation:

Use the given equivalence figures to write a proportion. Solve the proportion for the unknown value.

__

  quarts/liters = x/14 = 1/0.95 . . . . . the conversion is given as 1 qt = 0.95 L

Multiply by 14 to find x.

  x = 14(1/0.95) ≈ 14.7

There are about 14.7 quarts in 14 liters.

_____

<em>Additional comment</em>

You are given a value in liters (14 liters) and asked for the equivalent in quarts. That means you want to change the units from liters to quarts. To do that, you can multiply the given value (14 liters) by a conversion factor that has quarts in the numerator and liters in the denominator. That is what the fraction 1/0.95 is in the above. You will note that units of liters cancel in this equation.

  (14\text{ liters})\times\dfrac{1\text{ quart}}{0.95\text{ liter}}=\dfrac{14}{0.95}\text{ quarts}\approx14.7\text{ quarts}

This rule, "use a conversion factor that divides by the units you don't want and multiplies by the units you do want" applies to any units conversion problem. The conversion factor you use should <em>always</em> have <em>equal quantities</em> in the numerator and denominator. (Here, the equal quantities are 1 quart and 0.95 liters.)

You will notice that we treat units just like any variable. They can be multiplied, divided, cancelled, raised to a power. Only terms with like units can be added or subtracted.

4 0
2 years ago
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