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alekssr [168]
2 years ago
9

What is (-8.1)-(-8.9)

Mathematics
2 answers:
vladimir1956 [14]2 years ago
7 0
The answer will be 0.8 sorry if I’m late
polet [3.4K]2 years ago
5 0

Answer:

0.8

Step-by-step explanation:

-8.1+8.9=0.8

so the answer is 0.8

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Supposethat z is a normally distributed variable with variance 4. You collect a sample of size n for which you get a sample aver
Nikitich [7]

Answer:

The sample size is 4

Step-by-step explanation:

Null hypothesis: The mean is 2

Alternate hypothesis: The mean is less than 2

Mean = 3

sd = sqrt(variance) = sqrt(4) = 2

At 95% confidence level, t-value is 1.960

Assuming the lower bound of the mean is 1.04

Lower bound = mean - (t×sd/√n)

1.04 = 3 - (1.96×2/√n)

3.92/√n = 3 - 1.04

3.92/√n = 1.96

√n = 3.92/1.96

√n = 2

n = 2^2

n = 4

7 0
3 years ago
An iPhone costs £699 in London, €799 in Paris and $1,099 in New York. Using £1 = €1.13 and £1 = $1.37, state the lowest price of
Alex787 [66]

Answer:

£699 in London

£902.87 in Paris

£1505.63 in New York

The lowest price of the iPhone is £699 in London.

3 0
3 years ago
What is an equation of the line that passes through the points (0, -5) and<br> (-5, -1)?
nataly862011 [7]

Answer:

y=mx+b

y=-4/5x+5b

Step-by-step explanation:

(0,-5)

(-5,-1)

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use one of the points and substitute x to find the y intercept, which gives you the full equation, which is y=-4/5x+5

5 0
3 years ago
If mike read 30 pages an hour how long will it take him to read 1225 pages
Gnesinka [82]

Answer: 2450 min or 40hr and 50 min

Step-by-step explanation:

We can use a proportion to set up this equation.

\frac{30 pages}{60 min} =\frac{1225 pages}{x min}

We cross muliply so get our equation.

30x=1225(60)\\

30x=73500

x=2450 min

It took Mike 2450 min to read 1225 pages. We can also use a proportion to write this in hours

\frac{60min}{1hr} =\frac{2450min}{x }

60x=2450

x=40 hr 50 min

5 0
3 years ago
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