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3 years ago

How is the percent efficiency of a machine determined?

Mathematics

2 answers:

Stels [109]3 years ago

8 0

The answer is B. I just answered this question earlier!

Archy [21]3 years ago

7 0

Answer:

i need the ansrew too

Step-by-step explanation:

hehe

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PLEASE HELP!!!

vovangra [49]

Answer:

Michael drove faster than Jordan.

Step-by-step explanation:

Speed

The speed is the ratio between the distance d traveled by an object and the time t it took to move. In terms of a mathematical equation, it's expressed as:

$\displaystyle v=\frac{d}{t}$

Michael drove 210 miles in 3 and one-half hours. The parameters to calculate the speed are: d= 210 miles, t = 3.5 hours. The speed of Michael is:

$\displaystyle v_M=\frac{210}{3.5}=60\ mi/h$

Jordan drove 330 miles in 6 hours, thus his speed is:

$\displaystyle v_J=\frac{330}{6}=55\ mi/h$

It's clear that Michael drove faster than Jordan.

8 0

3 years ago

Determine the range of the function graphed above.

Sever21 [200]

Answer:

D. (-∞,4]

Step-by-step explanation:

The range is the y values

The lowest y values is negative infinity

The highest y values is 4

( - inf, 4]

We use the parentheses since we cannot get to negative infinity, the bracket since we reach 4

8 0

4 years ago

The area of a regular octagon is 35 cm 2 what is the area of a regular octagon with sides three times as large

Maurinko [17]

The area of a polygon = n*side^2 / (4 * tan(180/n))
where "n" is the number of sides

Let's calculate area for side = 2
area = 8*2^2 / (4 * tan(180/8))
area = 32 / (4 * tan(22.5))
area = 32 / 4*0.41421
 area = 19.3138746047 

Now, let's calculate area for side = 6
area = 8*6^2 / (4 * tan(180/8))
area = 288 / 1.65684 
area = 173.824871442 

 173.824871442 / 19.3138746047 = 9

So, the area would be 9 times larger.

ALSO, looking at the formula
n*side^2 / (4 * tan(180/n))
we can see that the side length appears just once in the formula and we are to square it in the calculation. So, if we increase the side length is increased by 3, then the area increases by 3^2 or 9.

5 0

3 years ago

How can I get this count y = 0.75x + 0.25

Andrews [41]

Answer:

what the question

Step-by-step explanation:

6 0

3 years ago

Negative 1 over 2 x + 1 = −x + 8

Damm [24]

Answer:

Step-by-step explanation:

8 0

3 years ago