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DIA [1.3K]
3 years ago
11

The triangles are similar.

Mathematics
2 answers:
MrMuchimi3 years ago
7 0
25/5 = 5
and also 
15/3 = 5
so
(3x+ 8)/5 = 4
3x + 8 = 20
3x = 12
  x = 12/3
  x = 4

answer is x = 4
Igoryamba3 years ago
6 0
3x + 8 = 4 * 5 = 20
x = 4
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Lori needs at least 12 liters of water to fill a water cooler. She has a container with 4.55 liters of
Stels [109]

Answer:

<u></u>

  • <u>Yes, she has enough water.</u>

Explanation:

To <em>estimate</em> the value, you can work with friendly numbers: numbers closed to the given numbers and with which you can perform easy mental calculations.

For example 4.55 may be rouned to 5, 4.85 may be rounded to 5, and 3.25 may be rounded to 3. That yields 5 + 5 + 3 = 13

Then, it seems you have about 13 liters. Is the final number equal or greater than 12 for sure?

To round 4.55 to 5 you increased the amount in 0.45, to round 4.85 to 5 you increased the amount by 0.15, and to round 3.25 to 3 you decreased the amount in 0.25.

What was the net change in your values: 0.45 + 0.15 - 0.25 = 0.60 - 0.25 = 0.35. Those are easy calculations that you can perform in your mind.

That means that you increased your total in less than 1 liter. Meaning that the final total is overestimated by 0.35, and that if you used the real amounts to make the calculations, the total will be still more than 12.

4 0
3 years ago
The first two angles in a triangle are 90 degrees and 50 degrees. What does the third angle have to be?
s2008m [1.1K]

Answer:

B) 40 degrees

Step-by-step explanation:

90 + 50 = 140

Each triangle have 180 °

180 - 140 = 40

5 0
3 years ago
Add or subtract as indicated. reduce to the lowest term. 1 1/3 + 2 1/3
Ann [662]
2 1/3 = 7/3

Both numbers should be improper fractions.

11/3 + 7/3 = 18/3

Now the fractions must be simplified
18 ÷ 3 = 6

So 11/3 + 2 1/3 = 6
6 0
3 years ago
Find the sum to n terms of the series 0.6+0.66+0.666+.....................
RSB [31]
<span>We have
</span>0.6+0.66+0.666+0.6666

Let's take 6 out from the series
6(0.1+0.11+0.111+0.1111+....

<span>Now multiply and divide by 9
</span>\frac{6}{9}(0.9+0.99+0.999+0.9999+....

\frac{6}{9}(1-0.1+1-0.01+1-0.001+1-0.0001+....&#10;\\&#10;\\\frac{6}{9}(1-10^{-1}+1-10^{-2}+1-10^{-3}+...

<span>all 1s add up to n
</span>\frac{6}{9}(n-\frac{1}{10}\times \frac{1-(\frac{1}{10})^{n+1}}{1-\frac{1}{10}})

8 0
3 years ago
(-3 - 5i)(-3 + 5i) =
Black_prince [1.1K]
Hello,
You don't know (a-b)(a+b)=a²-b²?

(-3)²=9
(5i)²=-25
Answer 9 +25=34


6 0
3 years ago
Read 2 more answers
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