Twitter allows companies to reach consumers with

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Answer 1

Answer:

Answer:

Short personal messages

Step-by-step explanation:

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I need help with parts b and c please!

Please help don't really understand pic below

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to simplify the equation just subtract 9-7 which simplifies to 11x+2

If you're just simplifying the expression and not solving, it would equal 11x + 2. You just have to combine like terms, so 9 - 7 and then add the 11x onto it.

Lynette has a metal doorstop with the dimensions shown. Each cubic centimeter of the metal in the doorstop has a mass of about 8.6 grams. Find the volume of the metal in the doorstop. Then find the mass of the doorstop.(Picture is provided)

Answers

Answer:

The answers are:

Volume: 75 cubic centimeters

Mass: 645 grams

Step-by-step explanation:

In order to determine both volume and mass of the doorstop, we have to know the formulas of a triangular prism.

I have attached an image that shows some formulas about triangular prism.

As we see in the image, a triangular prism consists basically in a triangular face and its projection.

So, using the variables and formula of the image:

B=10 cm

H=6 cm

L=2.5 cm

$V=(1)/(2)*B*H*L\nV=(1)/(2)*10*6*2.5\nV=75$

Then, we know the density of the metal that is:

δ= $8.6 (gr)/(cm^3)$

So, the mass of the doorstop is:

m=δ*V

m=8.6 $(gr)/(cm^3)$ * 75 $cm^3$

m=645 gr

Finally, the volume is 75 $cm^3$ and the mass 645 gr

75 is the volume. 510 is the mass.

How do I solve x^2 - 2x - 63 = 0 by completing the square? Like they showed me how here but I'm not sure how this appiles if there's already a c and it doesn't factor into something that can be perfectly squared.

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maybe you can try graphing it if the graph does not have any x-intercepts than it has no real roots

Basically you add a square after the 2x and then another square by the 63. Then, you use (b/2)^2 to put the answer in the square. Take b which is -2 in this case and divide it by 2. (-2/2= -1), then you square your answer (-1^2= 1). so after doing those calcualtions take the 1 that you got and put it in the first square. For the second square you will put the negative of that number which is -1. Then once you multiply the numbers by what is in the square you'll factor it and get your answer. This is really complicated and you may need to watch a video to get it.

72 is 40% of what number?

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All you have to do to find what number a certain number is a certain percentage of is to divide the known number by the percentage that it is reduced by.
To do this, we must first convert the percentage into a decimal. To do this, we can either divide the percentage by 100, or (my personal shortcut) just shift the decimal point over two places to the left.

40% = 0.4

Now, we divide the known by the percentage/decimal.

72 / 0.4 = 180

72 is 40% of 180.
Hope that helped! =)

A radio station spends 1/40 of each 24 hours on public service announcements. How much time is spent on public service announcements each day?

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Answer: They spent 0.6 hours =36 minutes on public service announcements each day.

Step-by-step explanation:

Since we have given that

Number of hours in a day = 24 hours

Fraction of hour a radio station spends on public service announcements = $(1)/(40)$

So, Number of hours spent on public service announcements each day would be

$(1)/(40)* 24\n\n=(24)/(40)\n\n=0.6\ hours$

As we know that

1 hour = 60 minutes

0.6 hours = 0.6×60 = 36 minutes

Hence, they spent 0.6 hours = 36 minutes on public service announcements each day.

Start by calling the time spend on announcements 'A'. We can then set up an equation to represent the problem:

$A=24hours * (1)/(40)$

and then solve by multiplication to get:

A=0.6hours

We could also convert this into minutes:

$A=0.6hours * (60mins)/(1hour) = 36mins$

Jackie is painting the roof of a dollhouse that is made up of three right triangles. One side of the roof is a scalene right triangle with a base of 8 inches and height of 6 inches. The other two sides are isosceles right triangles with bases of 10 inches each. Jackie has enough paint to cover 110 square inches of a roof. Does she have enough paint to cover the entire dollhouse roof?

Answers

Area of a triangle = $(1)/(2)bh$
Area of the scalene right angle = 1/2 x 8 x 6 = 4 x 6 = 24square inches
Area of the two isosceles triangles = 2(1/2 x 10 x 5) = 50 square inches
Total area of the roof = 24 + 50 = 74 square inches.
Therefore, Jackie has enough paint to cover the entire dollhouse.

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