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umka21 [38]
3 years ago
10

Please help ive been stuck on this for a very long time

Mathematics
2 answers:
bazaltina [42]3 years ago
8 0
It’s A because 3x+1 is = 3 x 2 = 5
Alexxx [7]3 years ago
7 0

By Thales' theorem:

\[\begin{array}{l}\frac{{18}}{{2x + 2}} = \frac{{24}}{{3x + 1}}\\18(3x + 1) = 24(2x + 2)\\54x + 18 = 48x + 48\\6x = 30\\x = 5\\A.\end{array}\]

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3x+y=15 <br> 3x-y=15 (using elimination method)
morpeh [17]

Answer:

x = 5

y = 0

Step-by-step explanation:

3x + y = 15

3x -y = 15

Add the two equations;

6x = 30

Inverse operations;

6x = 30

/6        /6

x = 5

Back substitute;

3(5) + y = 15

15 + y = 15

y = 0

5 0
3 years ago
Read 2 more answers
How do you factor the trinomial 3x^2+18x-21?
snow_lady [41]

Answer:

(3)(x+7)(x-1)

Step-by-step explanation:

3x^2+18x-21

Let's start by taking 3 out of the equation.

3(x^2+6x-7)

Now, when we factor, we need to find two numbers that add up to 6 and multiply to -7.

The numbers would be 7 and -1.

So the factored form of this would be:

(3)(x+7)(x-1)

7 0
3 years ago
9 – 2x = 19<br> What is x
iren2701 [21]

9-2x=19

or,-2x=19-9

or,-2x=10

or,x=10/-2

therefore,

x=-5

6 0
3 years ago
Read 2 more answers
Write and solve an equation for the following:
IrinaVladis [17]

Answer:

x = (180 - [71 + 9]) ÷ 2

Step-by-step explanation:

71 + 9 = 80

180 - 80 = 100°

100° ÷ 2 = 50°

7 0
2 years ago
45 POINTS PLEASE HELP!
andrew-mc [135]

Hello,

Question:

Jack popped some popcorn, but 3 of the 150 kernels did not pop.

Determine which popcorn snacks below has the same ratio of unpopped to total kernels as Jack's popcorn.

We Know:

3 out of 150 did not pop

Solution:

3/150 = 3 to 150

Find ratios similar to this one,

4/200

2/100

1/50

So now we know for every kernel that dosent pop there are 50 that did.

Answers:

4 unpopped out of 200 kernels

1 unpopped out of 50 kernels

8 0
3 years ago
Read 2 more answers
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