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Svetlanka [38]
3 years ago
7

20 is how much less than 30? what present less

Mathematics
1 answer:
kirill115 [55]3 years ago
5 0
30-20= 10

I believe it's that one.

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Need help asap!! !! !!
garri49 [273]

Answer:

18

Step-by-step explanation:

since U is the midpoint of QT, QT = 2(QU)

similarly, QS = 2 (QR)

because QR is parallel to QS and QU is parallel to QT, triangle QUR is similar to triangle QTS. therefore, the scaling factor between QT/QU and QS/QR is equal to the scaling factor between RU and ST.

therefore,

ST  = 2(RU)

36 = 2(RU)

18 =RU

3 0
2 years ago
What is the common denominator of -1/y and 2/5y
Anarel [89]
-1/y = 2/5y. The change from -1 to 2 would be -2, so we now that the change from y to 5y would also have to be -2. -2 = -10 so you multiply by 5. After doing the same to the top you would come to the conclusion that the LCD would be 5y.  Hope this helps!
4 0
3 years ago
Someone help me out please
iren [92.7K]

Answer:

Do you need work shown?

Step-by-step explanation:

(I don't know where to comment here)

7 0
3 years ago
If 50 students prefer vanilla ice cream, how many students were surveyed? 21% were vanilla, 19% were strawberry, 60% were chocol
AURORKA [14]
If 50 students prefer vanilla ice cream then 259 students were surveyed.
4 0
3 years ago
A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. The mean is found to be 10.3
user100 [1]

Answer:

Confidence interval for the true mean number of reproductions per hour for the bacteria is (10.1,10.5).

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 10.3

Population standard deviation, σ = 2.1

Sample size, n = 728

Alpha, α = 0.01

Confidence interval:

\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}

Putting the values, we get,

z_{critical}\text{ at}~\alpha_{0.01} = \pm 2.58

10.3 \pm 2.58(\frac{2.1}{\sqrt{728}} ) = 10.3 \pm 0.2008 = (10.0992,10.5008) \approx (10.1,10.5)

6 0
3 years ago
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