Harry and Ron are standing next to each other. Harry walks 15 feet north towards Hogwarts

Is (-5)+12 equal to 7 or is (-5)+(-12) equal to 7?

dezoksy [38]

Answer:

-5+12=7

Step-by-step explanation:

the second option is adding two negatives, which sums up to -17 rather than -7

<h2><em><u>xoxo,</u></em></h2><h2><em><u>your highness...</u></em></h2>

8 0

3 years ago

The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively, and their separat

VladimirAG [237]

Answer:

- 103.7

Step-by-step explanation:

Given:

Focal length of the eyepiece, f = 2.0 cm

Focal length of the objective lens, f' = 0.50 cm

Separation for minimum eyestrain = 6,0 cm

Image distance, v = - 25 cm

Now, from the lens formula,

$\frac{1}{f}=\frac{1}{u}+\frac{1}{v}$

here, u is the object distance

on substituting the respective values, we get

$\frac{1}{2}=\frac{1}{u}+\frac{1}{-25}$

or

u = 1.852 cm

also, the separation is adjusted for minimum eyestrain,

therefore, image distance for the objective lens, v' = 6 - 1.852 = 4.148 cm

Now, for the objective lens

using the lens formula, we get

$\frac{1}{0.5}=\frac{1}{u'}+\frac{1}{4.418}$

Here, u' is the distance between the physical object and objective lens

or

u' = 0.568 cm

Thus,

Magnification, m = $-\frac{vv'}{ff'}$

or

m = $-\frac{25\times4.418}{0.5\times2}$

or

m = - 103.7

4 0

2 years ago

Please help

Harrizon [31]

Answer:

(-1/2, 3/4)

Step-by-step explanation:

Let's use the elimination by adding or subtracting method. Note that we have 8y in the first equation, and that we could obtain -8y in the second equation by multiplying the second equation by 2:

2(24x - 4y = -15) => 48x - 8y = -30

Now combine this result (this equation) with the first equation:

2x + 8y = 5

+48x -8y = -30

---------------------

50x = - 25

Dividing both sides by 50, to isolate x, we get

x = -25/50 = -1/2.

Now substitute -1/2 for x in the first equation and solve the resulting equation for y:

2x + 8y = 5

2(-1/2) + 8y = 5, or -1 + 8y = 5, or 8y = 6 (after having added 1 to both sides)

Dividing both sides of 8y = 6 by 8 leads to determining the value of y:

y = 6/8 = 3/4

The solution is (-1/2, 3/4).

3 0

3 years ago

Which transformations could have occurred to map triangle ABC triangle A^ * B^ n C^ prime

zloy xaker [14]

Reflection and dilation is the transformation which will occur to map triangle ABC triangle to A^ * B^ n C^ prime.

<h3>What is a Triangle?</h3>

This refers to a plane figure which has features such as three angles and three sides.

Reflection and dilation involves flipping and enlargement/reduction respectively which gives rise to the sides being changed.

Read more about Triangle here brainly.com/question/1058720

#SPJ1

3 0

2 years ago

If m A.26°<br> B.42°<br> C.112°<br> D.124°

loris [4]

Is is the b becuase is b

3 0

3 years ago