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liberstina [14]

2 years ago

9

Brainliest if correct

1 answer:

Dmitriy789 [7]2 years ago

4 0

Step-by-step explanation:

$- 49x + 2.4 = 6 \\ - 49x = 6 - 2.4 \\ - 49x = 3.6 \\ x = \frac{3.6}{ - 49} \\ x = - \frac{18}{245} = - 0.0735$

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Explain how you<br> use a net to find the surface area of a<br> prism.

patriot [66]

Step-by-step explanation:

To find the total surface area of a prism, you need to calculate the area of two polygonal bases, i.e., the top face and bottom face. And then calculate the area of lateral faces connecting the bases. Add up the area of the two bases and the area of the lateral faces to get the total surface area of a prism.

Hope this helps!

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7 0

3 years ago

Read 2 more answers

What are the answers

Shalnov [3]

Slope formula:
y2-y1
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x2-x1
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1-3 -2
---- = ----
-2-4 -6

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5 0

3 years ago

Read 2 more answers

An electronic system has each of two different types of components in joint operation. Let X and Y denote the lengths of life, i

AURORKA [14]

Answer:

a

The average cost is $E(C) = 66$

b

The standard deviation of cost is $\sigma = 9.798$

Step-by-step explanation:

From the question we are told that

$E(X) = 4$

$E(Y) = 2$

$E(X^2) = 24$

$E(Y^2) = 8$

The cost of replacing the two component is C = 50 + 2 X + 4 Y

The variance of X is mathematically represented as

V(X) = $E(X^2) - [E(X)]^2$

Substituting values

$V[X] = 24 - 4^2$

$V[X] =8$

The variance of Y is mathematically represented as

V(Y) = $E(Y^2) - [E(Y)]^2$

Substituting values

$V[Y] = 8 - 2^2$

$V[X] =4$

The average of replacing the two component is

$E(C) = 2 * E(X) + 4* E(Y)$

substituting value

$E(C) = 50 + 2 * (4) + 4* (2)$

$E(C) = 66$

The variance of replacing the two component is

$V(C) = V(50 + 2X +4Y)$ Note: The variance of constant is zero

and X and Y are independent

=> $V(C) = 2^2 * V(X) + 4^2 * V(Y)$

substituting values

=> $V(C) = 4 * 8 + 16 * 4$

=> $V(C) = 32 + 64$

=> $V(C) = 96$

The standard deviation is

$\sigma = \sqrt{V(C)}$

substituting values

$\sigma = \sqrt{96}$

$\sigma = 9.798$

6 0

2 years ago

Is y^2+25y+200 a perfect trinomial

lukranit [14]

No because the perfect trinomial has a square as the third term and the middle term is a multiple of 2.

5 0

3 years ago

Given f(x) = 2x + 2, solve for x when f(x) = -4<br><br><br>Anyone know the answer?

Allushta [10]

X=-2 I’m pretty sure that’s the answer! :)

3 0

3 years ago