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2 years ago

I REALLY NEED HELP

1 answer:

8 0

There are 60 minutes in one hour, thus, 45 miles per hour is 45 miles per 60 minutes, thus

$\bf \begin{array}{ccll}
miles&minutes\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
45&60\\
240&m
\end{array}\implies \cfrac{45}{240}=\cfrac{60}{m}\implies m=\cfrac{240\cdot 60}{45}$

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Simplify 1/8 - 1/9 x+3/4-2/3x

Afina-wow [57]

Answer:

7/8 - 7x/9

Step-by-step explanation:

;)

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2 years ago

Is the number a rational number? Help me out please!

krek1111 [17]

Answer:

first answer

Step-by-step explanation:

Hi, this is correct because repeating decimals are rational numbers.

Rational numbers can be written by a fraction of integers.

If there is a pattern, it means that this is the division of two integers.

hope this helps

8 0

2 years ago

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Find the length and width of a rectangle that has the given area and a minimum perimeter. Area: 162 square feet

Gnom [1K]

Answer:

The width and length of rectangle is 12.728 m

Step-by-step explanation:

Let the length of the rectangle = L

let the width of the rectangle = W

The subjective function is given by;

F(p) = 2(L + W)

F = 2L + 2W

Area of the rectangle is given by;

A = LW

LW = 162 ft²

L = 162 / W

Substitute in the value of L into subjective function;

$f = 2l + 2w\\\\f = 2(\frac{162}{w} )+2w\\\\f = \frac{324}{w} + 2w\\\\\frac{df}{dw} = \frac{-324}{w^2} +2\\\\$

Take the second derivative of the function, to check if it will given a minimum perimeter

$\frac{d^2f}{dw^2}= \frac{648}{w^3} \\\\Thus, \frac{d^2f}{dw^2}>0, \ since,\frac{648}{w^3} >0 \ (minimum \ function \ verified)$

Determine the critical points of the first derivative;

df/dw = 0

$\frac{-324}{w^2} +2 = 0\\\\-324 + 2w^2=0\\\\2w^2 = 324\\\\w^2 = \frac{324}{2} \\\\w^2 = 162\\\\w= \sqrt{162}\\\\w = 12.728 \ m$

L = 162 / 12.728

L = 12.728 m

Therefore, the width and length of rectangle is 12.728 m

3 0

2 years ago

Solve for b.<br> 75 - 15 = 56 - 3<br> b =

ANEK [815]

Answer:4/3

Step-by-step explanation:

75-15-56=3b

4=3b

b=4/3

4 0

3 years ago

The equations of two functions are y = −25x + 5 and y = −28x + 4. Which function is changing more quickly? Complete the explanat

Agata [3.3K]

Answer:

The y= -28x+4 function is changing more quickly because the -28 of x is the bigger number meaning it is the bigger slope.

Step-by-step explanation:

hopefully that helps, if not let me know of the option you have that I can select from to fully answer the question.

3 0

2 years ago

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