3 years ago

4x + 8y = 20 -4x + 2y = -30 solve using elimination

Mathematics

1 answer:

Ahat [919]3 years ago

8 0

(7,-1)
comment if u want me to explain the answer

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D = {f, g, k}

atroni [7]

Answer:

Step-by-step explanation:

D∩L={f}

D∪L={a,f,g,j,k}

7 0

2 years ago

8 t-shirts and a hat costs £42 3 t-shirts and a hat costs £17 how much does the hat and t shirt cost

cestrela7 [59]

17 + 5shirts = 42
5shirts = 42-17 = 25
1shirt = 25/5 = 5

A shirt costs £5.

3*5 + 1hat = 17
15 + 1hat = 17
1hat = 2

A hat costs £2

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3 years ago

Some one help me with my bro’s hw

Liula [17]

Answer:

475604-71343= 404357

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4 0

2 years ago

Read 2 more answers

Suppose a research firm conducted a survey to determine the average amount of money steady smokers spend on cigarettes during a

olchik [2.2K]

Answer:

option (b) 0.0228

Step-by-step explanation:

Data provided in the question:

Sample size, n = 100

Sample mean, μ = $20

Standard deviation, s = $5

Confidence interval = between $19 and $21

Now,

Confidence interval = μ ± $z\frac{s}{\sqrt n}$

thus,

Upper limit of the Confidence interval = μ + $z\frac{s}{\sqrt n}$

$21 = $20 + $z\frac{5}{\sqrt{100}}$

z = 2

Now,

P(z = 2) = 0.02275 [From standard z vs p value table]

P(z = 2) ≈ 0.0228

Hence,

the correct answer is option (b) 0.0228

3 0

2 years ago

Milton needs to find the product of two numbers. one of the numbers is 9. The answer also needs to be 9. how will he solve this

galben [10]

The answer to this problem is one because nine times one equals nine which the answer is still nine

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3 years ago