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3 years ago

Use elimination to solve the system of equations given by 3x+ 4y= 5 and 21x+ 28y= 35.

Mathematics

1 answer:

neonofarm [45]3 years ago

3 0

Answer:

(5/4-3/4)

divide both sides by -7 then line them up and solve the equation and delete one variable.

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15a+2-7<br> What are the terms, like terms, coefficients, and constants in this equation?

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3 years ago

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F(x)=x-1, h(x)=-x+1 find (f o h)(7)

iris [78.8K]

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3 years ago

At a carnival, contestants are asked to keep rolling a pair of dice until they roll snake eyes. The number of rolls needed has a

Stells [14]

Answer:

The two numbers of rolls are 25.2 and 46.8.

Step-by-step explanation:

The Chebyshev's theorem states that, if X is a r.v. with mean µ and standard deviation σ, then for any positive number k, we have

$P (|X -\mu| < k\sigma) \geq (1-\frac{1}{k^{2}})$

Here

$(1-\frac{1}{k^{2}})=0.75\\\\\Rightarrow \frac{1}{k^{2}}=0.25\\\\\Rightarrow k=\sqrt{\frac{1}{0.25}}\\\\\Rightarrow k=2$

Then we know that,

$|X - \mu| \geq k\sigma,\\\\ \Rightarrow \mu - k\sigma \leq X \leq \mu + k\sigma$ .

Here it is given that mean (µ) = 36 and standard deviation (σ) = 5.4.

Compute the two values between which at least 75% of the contestants lie as follows:

$P(\mu - k\sigma \leq X \leq \mu + k\sigma)=0.75\\\\P(36 - 2\cdot\ 5.4 \leq X \leq 36 + 2\cdot\ 5.4)=0.75\\\\P(25.2\leq X\leq 46.8)=0.75$

Thus, the two numbers of rolls are 25.2 and 46.8.

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3 years ago

In a survey of 92 pet owners, 11 said they own a dog, and 39 said they own a cat. 4 said they own both a

LuckyWell [14K]

Answer:

35 people

Step-by-step explanation:

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2 years ago