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3 years ago

Can someone pleaaase help its timed

Mathematics

1 answer:

LenKa [72]3 years ago

3 0

Answer:

C. 48 cubic units

If you fill up the whole prism and it takes exactly 48 cubes then you did it correctly.

Step-by-step explanation:

To find the volume of a rectangular prism you have multiply the base by the height by the width.

So the volume is b*h*w = 8*2*3 = 48

C. 48 cubic units

Since 1 cube takes 1 unit that means it takes 48 cubes to fill up the whole thing.

If you fill up the whole prism and it takes exactly 48 cubes then you did it correctly.

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What is the slope of a line parallel to the line whose equation is 5x + 3y = 15

kifflom [539]

For two lines to be parallel, they must have the same slope...

3y=-5x+15

y=-5x/3 +5, y=mx+b, where m=slope so:

A parallel line with have a slope of -5/3

7 0

4 years ago

Solve for X <br>X/5 = 15

kramer

Answer:

Step-by-step explanation:

X/5=15

X=15*5

X=75

Ans.75

3 0

4 years ago

If x^2+1/x^2=3 find the value of x^2/(x^2+1)^2<br> Express answer as a common fraction.<br> Thanks!!

timama [110]

$x^2+\dfrac1{x^2}=3\implies x^4+1=3x^2\implies x^4-3x^2+1=0$

By the quadratic formula,

$x^2=\dfrac{3\pm\sqrt5}2\implies x^2+1=\dfrac{5\pm\sqrt5}2$

Then

$(x^2+1)^2=\dfrac{25\pm10\sqrt5+5}4=\dfrac{15\pm5\sqrt5}2$

$\implies\dfrac{x^2}{(x^2+1)^2}=\dfrac{\frac{3\pm\sqrt5}2}{\frac{15\pm5\sqrt5}2}=\dfrac{3\pm\sqrt5}{15\pm5\sqrt5}$

Multiply numerator and denominator by the denominator's conjugate:

$\dfrac{3\pm\sqrt5}{15\pm5\sqrt5}\cdot\dfrac{15\mp5\sqrt5}{15\mp5\sqrt5}=\dfrac{45\pm15\sqrt5\mp15\sqrt5-25}{15^2-(5\sqrt5)^2}=\dfrac{20}{100}=\dfrac15$

3 0

3 years ago

QUICK AND PLEASE DON'T USE SIN CON OR TAN IN YOUR PROOF!

andre [41]

The answer is b your welcome!!!!

8 0

3 years ago

-2x + y=10. what is the answer to this?<br> y=-1/3x+3

juin [17]

Answer:

x = - 3, y = 4

Step-by-step explanation:

Given the 2 equations

- 2x + y = 10 → (1)

y = - $\frac{1}{3}$ x + 3 → (2)

Substitute (2) into (1), that is

- 2x - $\frac{1}{3}$ x + 3 = 10 ( multiply through by 3 to clear the fraction )

- 6x - x + 9 = 30

- 7x + 9 = 30 ( subtract 9 from both sides )

- 7x = 21 ( divide both sides by - 7 )

x = - 3

Substitute x = - 3 into (2) for corresponding value of y

y = - $\frac{1}{3}$ (- 3) + 3 = 1 + 3 = 4

solution is x = - 3, y = 4

4 0

3 years ago