2 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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And 18 ounce box of raisins cause $2.88 a 24 ounce box of raisins cost $3.60 which one is the better deal

nadya68 [22]

Answer:

the 24-ounce box

Step-by-step explanation:

18/2.88 = 6.25$

24/3.6 = 6.67$

8 0

1 year ago

-x^2+4x-8 <br>axis of symmerty

V125BC [204]

Answer:

$\boxed {\boxed {\sf x=2}}$

Step-by-step explanation:

The axis of symmetry can be calculated using the formula:

$x=\frac{-b}{2a}$

First we must determine a and b from the quadratic: $-x^2+4x-8$ . This is in standard form, with the highest power first in descending order.

Standard form is also: $ax^2+bx+c$

If we compare this to the quadratic given, we can conclude that:

$a= -1 \\b= 4 \\c= -8$

Substitute the values for a and b into the formula.

$x= \frac{-(4)}{2(-1)}$

Multiply in the denominator.

$x=\frac {-4}{-2}$

Divide.

$x=2$

This can also be determined from the graph. It is the x-coordinate of the vertex or the maximum/minimum. It divides the quadratic into 2 symmetrical halves.

8 0

2 years ago

A. a teacher wants a large poster of the Declaration of Independence that is three times its actual size. What are the dimension

bonufazy [111]

1.25 or 0.50
because you rounded to a decimal

5 0

3 years ago

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Carrie and Nick get out of school at 2:45. They both ride the bus home. Carrie is dropped off at her house 25 minutes after scho

jarptica [38.1K]

Answer:

carrie is dropped off first

Step-by-step explanation:

2:45+25=3:10

and jack was dropped off at 3:15 so carrie is dropped off first

3 0

2 years ago

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Solve for x. Please help me.

mr_godi [17]

X=15 this is because 45+15 is equal to 60 and is equal to 4x so 4x=60 divide both sides by 4 to get x and you get x is equal to 15

6 0

2 years ago

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