Question

Solve for x: 3(x + 1) = -2(x - 1) - 4.

1

-1

-5

-25

Answer 1

Substitute given options in the equation and see for which value the equation holds true

Answer 2

-5?

Answer 3

3x + 3 = -2x -2

5x = -5 =>x = -1

Answer 4

@ganibl can you help me with one more?

Answer 5

Sure :)

Answer 6

ty! :] Solve for x: -3(x + 3) = -3(x + 1) - 5.

6

-6

All real numbers

No solution

Answer 7

-3x - 9 = -3x -8

Since x co-efficient is same on both sides (that is -3) This equation doesnt have any solution

Answer 8

thank you can you help with just a few more?

Answer 9

Solve for x: the quantity of x plus 20 over 2 = 3x

x = 10

x = 4

x = -14

x = -17

Answer 10

x + 20/2 = 3x

Just multiply both sides with 2 :)

x + 20 = 6x

5x = 20 :)

Now U get the answer :)

Answer 11

would it be x + 10? @ganibl

Answer 12

No its x+20 over 2 right so when u multiply x+20 over 2 with 2 u will be remained with x + 20 only

Answer 13

which do you think is the best answer?

Answer 14

x = 4

Answer 15

and for this one if I did it right it would be d. correct? Eddie has saved up $45 to purchase a new camera from the local store. The sales tax in his county is 7% of the sticker price. Write an equation and solve it to determine the value of the highest priced camera Eddie can purchase with his $45, including the sales tax. Round your answer to the nearest penny.

a. x - 0.07x = 45; $48.39

b. 0.7x = 45; x = $64.29

c.7x = 45; x = $6.43

d. x + 0.07x = 45; x = $42.06

Answer 16

Perfect :)

Answer 17

I have one last question :3 A social networking site recorded that 80% of the people who became members of the site one month were between 30 and 40 years old. The equation below represents this information, where x represents the total number of people who became members of the site that month.

x = 0.8x + 72

How many people who became members of the site that month were between 30 and 40 years of age?

112

288

360

432

Answer 18

@ganibl

Answer 19

Substitute the given options and check for which value the equation holds true and that will be ur answer :)

Answer 20

288?

Answer 21

or simple way is x - 0.8x = 72

0.2x = 72

x = 72/0.2

Answer 22

So it should be x = 360 :)

Answer 23

alright thank you :3 also I want to know if I did this right I got 4/25 Solve for x: 3 over 4 x + 5 over 8 = 4x

x = __________________ Write your answer as a fraction in simplest form. Use the "/" symbol for the fraction bar.

Answer 24

3/4x+5/8 = 4x

3*8/4x + 5 = 4x

24 = 16x^2 + 20x

16x^2 + 20x -24 = 0

4x^2 + 5x - 6 =0

Answer 25

what would the fraction be?

Answer 26

24/4x + 5 = 4x

24/16x^2 + 20x

6/4x^2 + 6/5x

Answer 27

How did u get 4/25?

Answer 28

(3/4 x + 5) / (8) = 4x
Cross multiply:
8 (4x) = (3/4 x + 5)
32x = 3/4 x + 5
32x - 3/4x = 5
128/4 x - 3/4x = 5
125/4 x = 5
125x = 20
x = 20/125
x = 4/25

Answer 29

Ah right :) I misunderstood the question :) I thought it as 3/4x+5/8 instead of (3/4x+5)/8

Answer 30

U got it perfect :)

Answer 31

can you double check this one cause im pretty sure its 288 A social networking site recorded that 80% of the people who became members of the site one month were between 30 and 40 years old. The equation below represents this information, where x represents the total number of people who became members of the site that month.

x = 0.8x + 72

How many people who became members of the site that month were between 30 and 40 years of age?

112

288

360

432

Answer 32

can u show ur work :) I am sure its 360 :)

Answer 33

x = 0.8x + 72

x - 0.8x = 72

x(1 - 0.8) = 72
0.2x = 72

x = 72/0.2

x = 72/2/10 = 720/2 = 360 :)

Answer 34

If we substitute 360 in the given equation

360 = 0.8(360) + 72

360 = 288 + 72 = 360

It satisfies :)

Answer 35

If we substitute 288 lets see how it goes

288 = 0.8(288) + 72

288 = 230.4 + 72 = 302.4 and is not equal to 288 :) So thats not ur answer

Answer 36

I just wrote it down ur correct :D thank you!

Answer 37

No Problem :)