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Vika [28.1K]
2 years ago
9

Helpppppppeeeeeeppepepeeeeee

Mathematics
1 answer:
valentina_108 [34]2 years ago
6 0

Answer:

21

Step-by-step explanation: hoped I helped

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Parallel lines "a" and "b" are cut by a transversal "c." What is "R" in the diagram below?
belka [17]

Answer:

I'm guessing it's 70°

Step-by-step explanation:

in the image above you can see I circled the 70°

the same angle is below it to the left. which means it's 70°

4 0
2 years ago
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Are 4 7/9 and repeating 4.7 are they equal?
cluponka [151]

Answer:

Step-by-step explanation:

These two expressions are definitely not equal.

4 7/9 is a repeating decimal:  4.77777 ...    (use your calculator)

whereqs 4.7 is NOT a repeating decimal.

4 0
3 years ago
In a random sample of 500 handwritten zip code digits, 464 were read correctly by an optical character recognition (OCR) system
In-s [12.5K]

Answer:

z= 2.38

P = 0.008656

Step-by-step explanation:

Here n= 500 and p~= 464/500= 0.928 and q`= 1- 0.928 = 0.072

We formulate our null and alternate hypothesis as

H0 =  0.9 ;       H0 > 0.9

The degree of confidence = 90%

z₀.₀₅ = 1.645 for  α= 0.05

We use the test statistic

z=  x- np/√npq

z= 466-500 *0.9/ √500 * 0.9(1-0.9)

z= 466- 450/ √45

z= 16/6.7082

z= 2.38

As the calculated value of z= 2.38  is greater than α =1.645 so we reject H0.

If H0 is true the P value is calculated as

P = 1- Ф( 2.38)

P = 1-0.991344=0.008656

7 0
3 years ago
Do the functions have the same concavity? f(x)=2x^2-10x-30
kumpel [21]

Answer:

Use the inflection points to set up intervals. Substitute a value into each interval to find where the curve is concave up or down.

The graph is concave up

5 0
3 years ago
Read 2 more answers
12 × (3 + 2²) ÷ 2 - 10
Lynna [10]

Answer:

32

Step-by-step explanation:

7 0
3 years ago
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