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Alekssandra [29.7K]
3 years ago
6

Math please help im failing this class its algebra

Mathematics
2 answers:
12345 [234]3 years ago
5 0

Answer:

y=5x+2

Step-by-step explanation:

-5x-4y=-8

-5x+y=2

y=2+5x

y=5x+2

astra-53 [7]3 years ago
4 0

Answer:

The answer would be zero 0

Step-by-step explanation:

1. move the constant to the left-hand side and changes it's sign

<em>-5x-4y=</em><em>-</em><em>8</em><em> </em><em>→</em><em> </em><em>-5x-4y+</em><em>8</em><em>=</em><em>0</em>

2. changes the signs of an both sides of the equation

<em>-5x-4y+</em><em>8</em><em>=</em><em>0</em><em> </em><em>→</em><em> </em><em>5</em><em>x</em><em>+</em><em>4</em><em>y</em><em>-</em><em>8</em><em> </em><em>=</em><em> </em><em>0</em>

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A rectangular box with a square base and a cover is to be built to contain 640 cubic feet. If the cost per square foot for the b
mixer [17]

Answer:

  $4800

Step-by-step explanation:

The cost is minimized when any pair of opposite faces of the box costs the same as any other pair. Since the top+bottom total $25 per square foot and the sides (left+right or front+back) total $20 per square foot, the area of a side must be 25/20 = 5/4 times the area of the top or bottom.

If we let x represent the length of one side of the square bottom, then 5/4x will be the height of the box. Its volume will be ...

  (5/4x)(x²) = 640 ft³

  x³ = (4/5)(640 ft³) = 512 ft³ . . . . . . multiply by 4/5

  x = 8 ft . . . . . . . . . . . . . . . . . . . . . . . take the cube root

The base area is then (8 ft)² = 64 ft², and the cost of the top+bottom is ...

  64 ft² × $25/ft² = $1600

The three pairs of opposite sides will cost 3×$1600 = $4800.

The minimum cost of the constructed box is $4800.

_____

You can also write an equation for the total cost in terms of x, the side length of the base. That cost function will be ...

  c(x) = 15x² + 10x² + 10·4x(640/x²)

This simplifies to ...

  c(x) = 25x² +25600/x

A graph shows the minimum is c(8) = 4800 (as above).

__

Algebraically, you can set the derivative to zero to find the value of x.

  dc/dx = 0 = 50x -25600/x²

  512 = x³ . . . . multiply by x²/50 and add 512

  8 = x . . . . . . . take the square root. Same solution as above. <em>Cost is minimized when the side length of the base is 8 ft</em>.

8 0
3 years ago
A bottle holds 8.2 ounces of disinfecting soap. Jesse used 0.2 of the soap in the bottle to clean the kitchen floor. How many ou
Softa [21]
In the question it said jesse used 0.2
3 0
3 years ago
When you calculate the sample size for a proportion, you use an estimate for the population proportion; namely . A conservative
LuckyWell [14K]

Answer: A. 0.50

Step-by-step explanation:

The formula to find the sample size : n=p(1-p)(\dfrac{ z^*}{E})

, where p= Prior estimate of population proportion.

E= Margin of error

z* =Critical z-value.

When , we do not have prior estimate of population proportion , we use p= 0.5 because at p=0.5 it gives the maximum same sample size for the corresponding confidence interval and margin of error.

Therefore , the conservative value for n can be obtained by using p=0.50.

Therefore , the correct answer is A.0.50 .

5 0
3 years ago
Multiply. <br> 8 1/2 -2 2/3
MrRissso [65]

Answer: -\frac{68}{3} or -22\ 2/3

Step-by-step explanation:

To solve this problem you must:

- Convert the mixed numbers to fractions, as following:

8\ 1/2=\frac{((8*2)+1)}{2}=\frac{17}{2}

2\ 2/3=\frac{((3(2)+2)}{3}=\frac{8}{3}

- Multiply both fractions. Mutilply the numerators and the denominators:

(\frac{17}{2})(-\frac{8}{3})=-\frac{136}{6}

- Simplify. Therefore, you obtain that the answer is:

-\frac{68}{3} or -22\ 2/3

5 0
3 years ago
Read 2 more answers
Help me please!!!!!
nadya68 [22]
Man tbh wth is this at this point just trow that mug out the window
5 0
3 years ago
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