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Finger [1]
3 years ago
5

Given: x + y = 10. If x = -21, what is y? 011 0-31 31

Mathematics
1 answer:
stepladder [879]3 years ago
3 0

Answer:

31

Step-by-step explanation:

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Which figures have rotation symmetry?<br> Select each correct answer
goblinko [34]

Answer:

The both on the right are the correct answers

Step-by-step explanation:

This is because rotational symmetry is defined as the property a shape has when it looks the same after some rotation by partial turns.

8 0
3 years ago
James knows that when he walks, he takes about 120
Tpy6a [65]

Answer:

speed of James is: 3.75 miles/hour.

Step-by-step explanation:

We need to find the speed of James in miles per hour(mi/hr)

we know that 1 mile=5280 feet

James takes 120 steps in 1 minute so he will cover 120×60 steps in 1 hour.

i.e. he takes 7200 steps in 1 hour.

also each step of James=2.75 feet

total distance covered by James in 1 hour=2.75×7200 feet=19800 feet

19800feet=\frac{19800}{5280} miles=3.65miles

hence speed of James= (distance covered by james in 1 hour)/1 hour

speed of James=3.75 miles/hour.

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7 0
2 years ago
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If the area square 3 is 80 cm^2 and the area of square 2 is 100 cm^2, what is the area of square 1
creativ13 [48]

Quite hard to explain:

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8 0
3 years ago
Which irrational number can be added to Pi to get a sum that is rational?
s2008m [1.1K]

Answer:

letter b

Step-by-step explanation:

4 0
3 years ago
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Dominos Pizza for years made a claim that they would deliver your pizza within 30 minutes ("30 minutes or less") of your order b
olchik [2.2K]

Answer:

a. t*

b. (22.87, 24.53)

c. yes

Step-by-step explanation:

We have the following data:

mean = m = 23.7

standard deviation = sd = 2.15

x = 20

Thus:

a. The critical value would be t * since the value is m <30

b. whenever the mean is less than 30, the t distribution is used, for 95% confidence interval with degree of freedom = (x - 1) df

 = 20 - 1

 = 19

now, for this value we look in the table of t, we find that t * = 1.729

m + - t * (sd / x ^ 81/2))

replacing

23.7 + - 1.729 * (2.15 / 20 ^ (1/2))

23.7 + - 0.8312

then the inverval would be:

23.7 + 0.8312 = 24.5312

23.7 - 0.8312 = 22.8688

(22.87, 24.53)

c. yes, the interval is accurate since the mean of 23.7 is within this value

6 0
3 years ago
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