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3 years ago

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Question 7(Multiple Choice Worth 75 points) Which of the following is true of all minerals? Made of many different elements Come

from the ground as crystals Can be liquids, solids, and gases Made of one or more elements from the periodic table

1 answer:

algol [13]3 years ago

4 0

The true statement is that minerals come from the ground as crystals. Hope this helps!

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Brenda is selling cakes for a fundraiser. Customer can buy pecan cakes for $7.75 and chocolate cake for $9.50. Brenda sold 39 ca

Stolb23 [73]

Answer:

27 chocolate cake and 12 pecan cake

Step-by-step explanation:

7 0

3 years ago

Graph y=sin^-1 (1/4 x) on the interval -5≤x≤5.

GaryK [48]

Answer:

D

Step-by-step explanation:

The arcsine ( $\sin^{-1}$ ) function of x is defined as the inverse sine function of x when -1≤x≤1.

So, when

$-4\le x\le 4,$

we have that

$-1\le \dfrac{1}{4}x\le 1.$

This gives us the domain $-4\le x\le 4$ of the function $y=\sin^{-1}\left(\dfrac{1}{4}x\right).$

The range of the function $y=\sin^{-1}x$ is $-\dfrac{\pi }{2}\le x\le \dfrac{\pi }{2},$ so the range of the function $y=\sin^{-1}\left(\dfrac{1}{4}x\right)$ is the same (options A and C are false).

When x=-4,

$y=\sin^{-1}\left(\dfrac{1}{4}\cdot (-4)\right)=\sin^{-1}(-1)=-\dfrac{\pi}{2}.$

So, option B is false and option D is true.

4 0

3 years ago

A local chess club claims that the length of time to play a game has a standard deviation of more than 13 minutes. Write sentenc

tatyana61 [14]

Answer:

Step-by-step explanation:

A type I error occurs when the researcher rejects the null hypothesis when it is actually true.

A type II error occurs when the research fails to reject the null hypothesis when it is not true.

In this case study,

The null hypothesis is the standard deviation is less that or equal to 13min.

The alternative hypothesis would be that the standard deviation is greater than 13mins.

A type I error would occur when having done an experiment, the researcher rejects the null hypothesis when there is enough evidence that it is actually either less or equal to 13mins

A type II error would occur when the researcher fails to reject the null hypothesis when there is enough evidence that it is actually more than 13mins.

6 0

3 years ago

How do you solve this equation<br> 5(8x-2)=270

raketka [301]

5(8x-2)=270
distribute the 5 into 8x-2
5*8x-5*2=270
you get
40x-10=270
combine like terms
40x=280
divide both sides by 40 to find x
x=7

5 0

3 years ago

The equation-4 - x = -13 has the solution

liq [111]

Answer:

x = 9

Step-by-step explanation:

Step 1: Write equation

-4 - x = -13

Step 2: Solve for <em>x</em>

<u>Add 4 to both sides:</u> -x = -9

<u>Divide both sides by -1:</u> x = 9

Step 3: Check

<em>Plug in x to verify if it's a solution.</em>

-4 - 9 = -13

-13 = -13

8 0

3 years ago

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