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3 years ago

Surface area of a cube

Mathematics

1 answer:

Lynna [10]3 years ago

3 0

Answer:

i think think a square would have 6 as a surface area

Step-by-step explanation:

soryr if im wrong

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I need help with number 11 please

ryzh [129]

Answer:

Step-by-step explanation:

because if 3 kids are in the front and kids only sad behind those three kids

three kids sat behind them

5 0

4 years ago

Which of the following expression is equal to x^2+25?

nignag [31]

A: (x + 5i)^2
= (x + 5i)(x + 5i)
= (x)(x) + (x)(5i) + (5i)(x) + (5i)(5i)
= x^2 + 5ix + 5ix + 25i^2
= 25i^2 + 10ix + x^2

B: (x - 5i)^2
= (x + - 5i)(x + - 5i)
= (x)(x) + (x)(- 5i) + (- 5i)(x) + (- 5i)(- 5i)
= x^2 - 5ix - 5ix + 25i^2
= 25i^2 - 10ix + x^2

C: (x - 5i)(x + 5i)
= (x + - 5i)(x + 5i)
= (x)(x) + (x)(5i) + (- 5i)(x) + (- 5i)(5i)
= x^2 + 5ix - 5ix - 25i^2
= 25i^2 + x^2

D: (x + 10i)(x - 15i)
= (x + 10i)(x + - 15i)
= (x)(x) + (x)(- 15i) + (10i)(x) + (10i)(- 15i)
= x^2 - 15ix + 10ix - 150i^2
= - 150i^2 + 5ix + x^2

Hope that helps!!!

6 0

3 years ago

Read 2 more answers

Find the slope of the line described by 3y = x + 6.

Alexxx [7]

$3y = x +6 \\\\\implies y = \dfrac 13 (x+6)\\\\\implies y = \dfrac 13 x + 2\\\\\text{The above equation is in a form of y = mx +b, where m is the slope.}\\\\\\\text{Hence slope of the line,}~ m= \dfrac 13$

7 0

2 years ago

Solve sin^4(x)+cos^4(x)=cos4x

ICE Princess25 [194]

$\sin^4x=(\sin^2x)^2=\left(\dfrac{1-\cos2x}2\right)^2=\dfrac{1-2\cos2x+\cos^22x}4$
$\cos^4x=(\cos^2x)^2=\left(\dfrac{1+\cos2x}2\right)^2=\dfrac{1+2\cos2x+\cos^22x}4$

$\implies \sin^4x+\cos^4x=\dfrac{2+2\cos^22x}4=\dfrac{1+\cos^22x}2$

$\cos^22x=\dfrac{1+\cos4x}2$
$\implies\sin^4x+\cos^4x=\dfrac{1+\frac{1+\cos4x}2}2=\dfrac{3+\cos4x}4$

So the equation reduces to

$\dfrac{3+\cos4x}4=\cos4x$
$\dfrac34=\dfrac34\cos4x$
$\cos4x=1$

We have $\cos\theta=1$ whenever $\theta=0+2k\pi=2k\pi$ , where $k$ is any integer. This means for this equation we have solutions at

$4x=2k\pi\implies x=\dfrac{k\pi}2$

6 0

4 years ago

Please help! Correct answer gets brainliest! Guesses will be reported!

ella [17]

Answer:

The shaded shape on the grid is a rectangle. ...

Perimeter of the shaded shape = 3 + 4 + 3 + 4 = 14 units.

Area of the shaded shape = length × width.

Step-by-step explanation:

3 0

3 years ago

Surface area of a cube​

Surface area of a cube