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3 years ago

Which expressions are equivalent to 7 (negative three-fourths x minus 3)? Select two options.

Mathematics

2 answers:

Gre4nikov [31]3 years ago

8 0

Answer:sorry but thats the wrong answer it a a and c

Step-by-step explanation:

steposvetlana [31]3 years ago

6 0

Answer:

its b

Step-by-step explanatio Whichexpression is not equivalent to Negative 3 x minus one-half + 4 y?

2 y minus 5 x minus one-half + 2 y + 2 x

Negative 2 x minus one-half + 6 y + 3 x

Negative 3 x minus three-fourths + 4 y + one-fourth

Negative 3 y minus three-fourths + 7 y + one-fourth minus 3 x

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An aquarium with a square base has no top. There is a metal frame. Glass costs 8 dollars/m^2 and the frame costs 7 dollars/m. Th

Irina-Kira [14]

Given that the volume of the aquarium is 20m^3.

Volume = Area of Base x height

Area of Base = Volume / height = 20/h

Given that the aquarium has a square base.

Area of square = l^2

Thus, the length of the base of the aquarium is $\sqrt{area \ of \ base} = \sqrt{ \frac{20}{h} }$

The frame is to cover 8 sides with the length equal to the length of the base and 4 sides with the length of the height.

Thus, the total perimeter of the frame is given by $8\sqrt{\frac{20}{h}}+4h= \sqrt{64\left(\frac{20}{h}\right)}+4h = \sqrt{\frac{1,280}{h}}+4h$

Area of the four side faces of the aquarium is 4 times the length of the base times the height = $4\times\sqrt{ \frac{20}{h} }\times h=\sqrt{16\left(\frac{20}{h}\right)h^2}=\sqrt{320h}$

Total area to be covered by grass is the base and the four side faces and is given by $\frac{20}{h}+\sqrt{320h}$

Cost of the entire metal frame = $7\left(\sqrt{\frac{1,280}{h}}+4h\right)= \sqrt{49\left(\frac{1,280}{h}\right)}+7(4h) = \sqrt{\frac{62,720}{h}}+28h$

Cost of the entire grass = $8\left(\frac{20}{h}+\sqrt{320h}\right)=\frac{160}{h}+\sqrt{64(320h)}=\frac{160}{h}+\sqrt{20,480h$

Therefore, total cost in terms of the height, h, is given by

$C=\sqrt{\frac{62,720}{h}}+28h+\frac{160}{h}+\sqrt{20,480h$

3 0

3 years ago

Ned created a video that was originally 40 minutes

Zanzabum

Answer:

36.8 minutes or 36 minutes 48 seconds

Step-by-step explanation:

8 percent of 40 is 3.2

(.08 times 40)

40 minus 3.2 is 36.8 :)

(.8 times 60 is 48)

3 0

3 years ago

Read 2 more answers

1. The compound interest on $2500 for 5 years at 4% per annum<br> (compounded annually) is

Elden [556K]

Answer:

$9000

Step-by-step explanation:

I am Majoring in Math and Personal Finance.

4 0

2 years ago

PLEASE HELP WILL GIVE BRAINLIEST

saul85 [17]

Answer:

$\sqrt{0.02}$

Step-by-step explanation:

Let's first get the square root of 0.02...

≅ $0.1414$

Let's convert that to a percentage...

14.14%, which is less than 18%, so it checks out in that sense...

Now, let's convert 0.1414 to a fraction...

$\frac{707}{5000}$ , which is greater than $\frac{1}{8}$ (You can check this by multiplying $\frac{1}{8}$ by $\frac{625}{625}$ )

Therefore, $\sqrt{0.02}$ makes the inequality true.

6 0

3 years ago

Anybody know the correct answer to this?

Digiron [165]

$A=\{x|x=3n,\ n\in\{2,\ 3,\ 4\}\}=\{(3)(2),\ (3)(3),\ (3)(4)\}=\{6,\ 9,\ 12\}\\\\B=\{x|x=4m-3,\ m\in\{1,\ 2,\ 3\}\}\\=\{(4)(1)-3,\ (4)(2)-3,\ (4)(3)-3\}=\{1,\ 5,\ 9\}\\\\A\ \cap\ B=\{9\}$

Answer: 9

4 0

3 years ago