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4 years ago

Solve the equation for y. 2x + 5y = 5 y=x +1 y= -10% + 25 y=22+1 y=x +5

Mathematics

1 answer:

Elena-2011 [213]4 years ago

4 0

Answer:

y=-2/5x+1

y=x+1

y=249/10

y=23

y=x+5

Step-by-step explanation:

Let's solve for x.

y=x+5

Step 1: Flip the equation.

x+5=y

Step 2: Add -5 to both sides.

x+5+−5=y+−5

x=y−5

Answer:

x=y−5

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The probability model below describes the number of repair calls that an appliance repair shop may receive during an hour. Compl

defon

Answer:

a) So, she can expect a 2.4 calls per hour.

b) So, the standard deviation is 0.8.

Step-by-step explanation:

We know that probability model below describes the number of repair calls that an appliance repair shop may receive during an hour.

Repair Calls 1 2 3 4

Probability 0.1 0.5 0.3 0.1

a) We calculate how many calls should the shop expect per hour.

We get:

$E(X)=1\cdot0.1+2\cdot0.5+3\cdot0.3+4\cdot0.1\\\\E(X)=0.1+1+0.9+0.4\\\\E(X)=2.4$

So, she can expect a 2.4 calls per hour.

b) We calculate the standard deviation:

$\sigma=\sqrt{(1-2.4)^2\cdot 0.1+(2-2.4)^2\cdot 0.5+(3-2.4)^2\cdot 0.3+(4-2.4)^2\cdot 0.1}\\\\\sigma=\sqrt{0.196+0.08+0.108+0.256}\\\\\sigma=\sqrt{0.64}\\\\\sigma=0.8$

So, the standard deviation is 0.8.

3 0

3 years ago

Use the Pythagorean Theorem to find the missing length and then round the

kifflom [539]

Answer:

13.03

Step-by-step explanation:

7 x 7 = 49

11 x 11 = 121

121 + 49 = 170

The square root of 170 is 13.03

Hope this helped!

(And maybe give me brainliest?)

Have a great day!

5 0

3 years ago

Read 2 more answers

Which best describes the relationship between the line that passes through the points (-6,5) and (-

natita [175]

Answer:

Slope passes through (-6, 5) and (-2, 7)

$m_1=\frac{y_2-y_1}{x_2-x_1} =m_1=\frac{7-5}{-2+6}$

$m_1=\frac{2}{4} =\frac{1}{2}$

Slope passes through (4, 2) and (6, 6)

$m_2=\frac{6-2}{6-4}$

$\frac{4}{2} =2$

$m_1\times m_2 \neq -1$ $m_1\neq m_2$

<u>Answer:- A) neither perpendicular nor parallel.</u>

<u>OAmalOHopeO</u>

3 0

3 years ago

Help please and thanks! I'll award brainliest if you show your work as well :)

iren2701 [21]

Answer:

6 inches

Step-by-step explanation:

Formula for surface area of a cylinder:

$SA=2\pi r^{2} +2\pi rh$

Plug in values and solve for the radius:

$180\pi =2\pi r^{2} +2\pi r(9)\\$

Divide both sides by $2\pi$

$90=r^{2} +r(9)$

Subtract 90 from both sides

$0=r^{2} +9r-90$

Use the quadratic equation to find the roots

$x=(-b$ ± $\sqrt{b^2-4ac})*\frac{1}{2a}$ (sorry for formatting, Brainly doesn't

allow equations with ± in them)

$x=\frac{-9+\sqrt{9^2-4*1*90} }{2(1)}$ and $x=\frac{-9-\sqrt{9^2-4*1*90} }{2(1)}$

$x=\frac{(-9+\sqrt{81+360})}{2}$ and $x=\frac{(-9-\sqrt{81+360})}{2}$

$x=\frac{(-9+\sqrt{441})}{2}$ and $x=\frac{(-9-\sqrt{441})}{2}$

$x=\frac{(-9+21)}{2}$ and $x=\frac{(-9-21)}{2}$

$x=\frac{12}{2}$ and $x=\frac{-30}{2}$

$x=6$ and $x=-15$

We can't have a negative radius, so that leaves us with r=6 in.

8 0

2 years ago

Pls I need it for a testI’ll give out 20 points

kompoz [17]

Answer:

It should be D.

Step-by-step explanation:

6 0

2 years ago