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3 years ago

I NEED HELP PLEASE!! How to calculate efficiency of a simple machine?

1 answer:

5 0

Efficiency = (output)/(input).
This could also be written as
efficiency= output/(output+losses)
or
eff=(input-losses)/input

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Write an equation of the line through each pair of points in slope-intercept form.

ASHA 777 [7]

Answer:

see below

Step-by-step explanation:

a) (– 3, –2) and (–3, 4)

First you want to find the slope of the line that passes through these points. To find the slope of the line, we use the slope formula: (y₂ - y₁) / (x₂ - x₁)

Plug in these values:

(4 - (-2) / (-3 - (-3))

Simplify the parentheses.

= (4 + 2) / (-3 + 3)

Simplify the fraction.

(6) / (0)

= undefined

If your slope is undefined, it is a vertical line. The equation of a vertical line is x = #.

In this case, the x-coordinate for both points is -3.

Therefore, your equation is x = -3.

b) (3, 2) and (–4, –5)

First you want to find the slope of the line that passes through these points. To find the slope of the line, we use the slope formula: (y₂ - y₁) / (x₂ - x₁)

Plug in these values:

(-5 - 2) / (-4 - 3)

Simplify the parentheses.

= (-7) / (-7)

Simplify the fraction.

-7/-7

= 1

This is your slope. Plug this value into the standard slope-intercept equation of y = mx + b.

y = 1x + b or y = x + b

To find b, we want to plug in a value that we know is on this line: in this case, I will use the first point (3, 2). Plug in the x and y values into the x and y of the standard equation.

2 = 1(3) + b

To find b, multiply the slope and the input of x(3)

2 = 3 + b

Now, subtract 3 from both sides to isolate b.

-1 = b

Plug this into your standard equation.

y = x - 1

This is your equation.

Check this by plugging in the other point you have not checked yet (-4, -5).

y = 1x - 1

-5 = 1(-4) - 1

-5 = -4 - 1

-5 = -5

Your equation is correct.

Hope this helps!

7 0

3 years ago

A christmas gift to you to earn some points

Katyanochek1 [597]

Answer:

2229 thanks, merry early Christmas

6 0

3 years ago

In Germany, VAT is at 19%

aleksley [76]

Answer:

Amount of VAT paid by Jeremy is € 9.31 .

Step-by-step explanation:

As given

In Germany, VAT is at 19% .

Jeremy buys a calculator in Germany for €58.31

This price includes VAT.

Let us assume that the cost of calculator excluding tax is x .

19% is written in the decimal form .

$= \frac{19}{100}$

= 0.19

VAT Price = 0.19 × Cost price of calculator excluding VAT

= 0.19 × x

= 0.19x

Than

Cost of calaculator + VAT price = Cost of calculator including VAT

x + 0.19 × x = 58.31

x + 0.19x = 58.31

1.19x = 58.31

$x = \frac{58.31}{1.19}$

x = €49 (Approx)

Thus cost price of calculator excluding VAT is €49 .

VAT Price = 0.19 × Cost price of calculator excluding VAT

= 0.19 × 49

= € 9.31

Therefore the amount of VAT paid by Jeremy is € 9.31 .

6 0

2 years ago

A box in the shape of a cube has a volume of 64 cube inches. What is the length of a side of the box

Naily [24]

The volume of a cube can be expressed as

Let V = volume

Let a = side length

V = a^3

We need to solve the formula to isolate the variable a. First, we must cube root each side.

∛(V) = a. With our new formula, we plug in 64 cube inches into V.

∛(64) = a.

4 = a.

The length of one side on our cube is 4 inches.

8 0

3 years ago

Please help :)

erica [24]

Recall that the range is the distance between the smallest and largest values. Or put another way, it is equal to the difference of the min and max

Range = Max - Min

So if we're told the range is 3, then this means the smallest and largest data values are 3 units away from each other

Answer: Choice B

6 0

3 years ago

Read 2 more answers