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3 years ago

Help me in both please it’s a test and i need help

Mathematics

1 answer:

nataly862011 [7]3 years ago

5 0

1. -2x + 3y + 5

A. -x + -x + y + y + y + 1 + 1 + 1 + 1 + 1

B. -x + -x + 2y + y + 4 + 1

D. -5x + 3x + 4y - y + 4 + 1

2. -$40 + 100 = $60 - $50 = $10

Cindy currently has $10 left in her bank account.

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Negative 5.4 + x = 12.2. Minus 5.4. x = 6.8.<br> What error, if any, did she make?

lisabon 2012 [21]

Answer:

The answer is correct x =6.8, if she made an error, it might have been the steps she took.

Step-by-step explanation:

5.4 + x = 12.2

subtract 5.4 from both sides to put x terms on the left hand side, numerical number terms on the right hand side

5.4 - 5.4 + x = 12.2 - 5.4

x = 6.8

3 0

2 years ago

Lets evaluate (3^6)^1/2<br><br>step by step.

maksim [4K]

Answer:

Step-by-step explanation:

$\bigg(3^6\bigg)^{\frac{1}{2}}$

use

$(a^n)^m=a^{n\cdot m}$

$\bigg(3^6\bigg)^{\frac{1}{2}}=3^{6\cdot\frac{1}{2}$

simplify

$6\!\!\!\!\diagup^3\cdot\dfrac{1}{2\!\!\!\!\diagup_1}=3\cdot\dfrac{1}{1}=3\cdot1=3$

other

$6\cdot\dfrac{1}{2}=\dfrac{6\cdot1}{2}=\dfrac{6}{2}=3$

therefore

$\bigg(3^6\bigg)^{\frac{1}{2}}=3^{6\cdot\frac{1}{2}}=3^3=\underbrace{3\cdot3\cdot3}_{3}=27$

7 0

3 years ago

Read 2 more answers

Pleaseee help<br> BRAINLIESt!!!!

Yakvenalex [24]

Answer:

C y cause it was already there plus ik super late but hey sum points

Step-by-step explanation:

5 0

3 years ago

Use cylindrical coordinates. find the volume of the solid that is enclosed by the cone z = x2 + y2 and the sphere x2 + y2 + z2 =

sashaice [31]

Let $R$ be the solid. Then the volume is

$\displaystyle\iiint_R\mathrm dV=\int_{\theta=0}^{\theta=2\pi}\int_{r=0}^{r=\sqrt8}\int_{\zeta=r^2}^{\zeta=\sqrt{72-r^2}}r\,\mathrm d\zeta\,\mathrm dr\,\mathrm d\theta$

which follows from the facts that

$\begin{cases}x=r\cos\theta\\y=r\sin\theta\\z=\zeta\end{cases}\implies\mathrm dx\,\mathrm dy\,\mathrm dz=r\,\mathrm dr\,\mathrm d\theta\,\mathrm d\zeta$
(by computing the Jacobian)

and

$z=x^2+y^2=r^2\implies z+z^2=72\implies z=-9\text{ or }z=8$
(we take the positive solution, since it's clear that $R$ lies above the $x$ - $y$ plane)
$r^2+z^2=72\implies z=\pm\sqrt{72-r^2}$
(again, taking the positive root for the same reason)
$z=r^2\implies 8=r^2\implies r=\sqrt8$

$\displaystyle\int_{\theta=0}^{\theta=2\pi}\int_{r=0}^{r=\sqrt8}\int_{\zeta=r^2}^{\zeta=\sqrt{72-r^2}}r\,\mathrm d\zeta\,\mathrm dr\,\mathrm d\theta$
$=\displaystyle2\pi\int_{r=0}^{r=\sqrt8}\int_{\zeta=r^2}^{\zeta=\sqrt{72-r^2}}r\,\mathrm d\zeta\,\mathrm dr$
$=\displaystyle2\pi\int_{r=0}^{r=\sqrt8}r(\sqrt{72-r^2}-r^2)\,\mathrm dr$
$=\displaystyle2\pi\int_{r=0}^{r=\sqrt8}(r\sqrt{72-r^2}-r^3)\,\mathrm dr$
$=\dfrac{32(27\sqrt2-35)\pi}3$

7 0

3 years ago

Find the area of the shape shown below. NEED HELP ASAPPPPPPPPP

Fittoniya [83]

Answer: A = 7 unit^2

Explanation:

First let’s cut the shape into 1 square and 1 trapezoid.

After that we can calculate the 2 polygons individually

Find area of square:

A = 2 x 2 = 4

Find area of trapezoid:

A = (2 + 1)2/2 = 3

Find area of the whole shape

7 0

3 years ago