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4 years ago

A number is 65 when you subtract 6 then add 7. What is the number?

1 answer:

4 0

The problem can be modeled like this:

x - 6 + 7 = 65

x + 1 = 65

x = 64

The number is 64. Since -6 + 7 = 1, you could have also simplified the question to, "A number is 65 when you add 1. What is the number?"

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kvasek [131]

I tried to help but couldn’t :)

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3 years ago

It has long been stated that the mean temperature of humans is 98.698.6degrees°F. However, two researchers currently involved i

const2013 [10]

Answer:

The claim is false that the mean temperature of humans is less than 98.6°F

Step-by-step explanation:

Claim :The mean temperature of humans is less than 98.6°F

$H_0:\mu \geq 98.6^{\circ}F\\H_a:\mu< 98.6^{\circ}F$

They obtained 200 measurements

Sample size n =200

x = 98.3°F

$\sigma = 11^{\circ}F$

Since n > 30

So we will use z test

Formula : $z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}$

Substitute the values in the formula :

$z=\frac{98.3-98.6}{\frac{11}{\sqrt{200}}}$

$z=−0.385$

Refer the z table for p value

p value = 0.3520

α= 0.01

p value > α

So, we accept the null hypothesis.

So, the claim is false that the mean temperature of humans is less than 98.6°F .

6 0

4 years ago

Mr. Brown purchased 5.75 pounds of chicken that cost $2.40 per pound.

FinnZ [79.3K]

Answer:

8.15 is the answer

Step-by-step explanation:

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3 years ago

Solve the equation r = 1/(x-1) for x in terms of r. In other words, manipulate the equation until you have x equal to an express

BlackZzzverrR [31]

Answer:

$x=\dfrac{1+r}{r}$

Step-by-step explanation:

Given equation:

$r=\dfrac{1}{(x-1)}$

Multiply both sides by (x - 1):

$\implies r(x-1)=\dfrac{1}{(x-1)} \cdot (x-1)$

$\implies r(x-1)=1$

Expand the brackets:

$\implies rx-r=1$

Add r to both sides:

$\implies rx-r+r=1+r$

$\implies rx=1+r$

Divide both sides by r:

$\implies \dfrac{rx}{r}=\dfrac{1+r}{r}$

$\implies x=\dfrac{1+r}{r}$

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2 years ago

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A number is randomly selected from 10 to 20. X is the event of selecting

lions [1.4K]

Answer:

not sure

Step-by-step explanation:

can someone explain?

6 0

3 years ago

Read 2 more answers