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Dominik [7]
3 years ago
10

2x - 7 -+1=3x - 4 4 .

Mathematics
1 answer:
vesna_86 [32]3 years ago
5 0

Answer:

x = 0.4

Step-by-step explanation:

Move the 1 on the left to the right

This would result in

(2x - 7)/4 = 1 + 3x - 4

Solving this would result in

(2x- 7)/4 = 3x - 3

Move the 4 to the right

Solving this would result in:

2x - 7 = 12x - 3

Now, it is just basically solving for x

2x - 12x = -3 +7

-10x = -4

x  = 0.4

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An object is placed 21 cm from a concave lens of focal length 25 cm. what is the magnification?
wariber [46]

The magnification is 0.54

Given,

The distance between object and concave lens, u = -21 cm

Focal length of the concave lens, f = -25 cm

Let m be the magnification.

m = v/u

Here v is the position of image.

We have to find v first.

By using lens equation we can determine v.

That is,

1/f = 1/v – 1/u

So,

- (1/25) = 1/v – (-1/21)

- (1/25) = 1/v + 1/21

1/v = - (1/25) – 1/21

1/v = (-25 – 21) / (21 x 25)

1/v = - (46/525)

Therefore v = - (525/46)

   v = -11.41 cm

Now we have to find magnification, m.

m = v/u

   = (-11.41) / (-21)

   = 0.54

Here magnification is 0.54

Learn more about concave lens here: brainly.com/question/12944945

#SPJ4

6 0
2 years ago
The state fair needs to sell $100 worth of food this wednsday if hotdogs cos $3 and hamburgers cos $5. Determine how many hotdog
shepuryov [24]

Answer:

If 5 hamburgers are sold, 25 hotdogs need to be sold.

If 10 hamburgers are sold, 17 hotdogs need to be sold.

If 15 hamburgers are sold, 9 hotdogs need to be sold.

Step-by-step explanation:

4 0
3 years ago
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