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nadezda [96]
3 years ago
14

Can some on help me on this question?

Mathematics
2 answers:
mario62 [17]3 years ago
6 0

Answer:

x=10 and x-7 is the answer

Step-by-step explanation:

a)2x-7=13

2x=13+7

2x=20

x=20/2

x=10

b)3x+4=25

3x=25-4

3x=21

x=21/3

x=7

i hope it will help you

denpristay [2]3 years ago
5 0

Answer:

a) x=10

b) x=7

Step-by-step explanation:

a)

2x-7=13

<em>Add 7 to both sides</em>

2x=20

<em>Divide both sides by 2</em>

x=10

b)

3x+4=25

<em>Subtract 4 from both sides</em>

3x=21

<em>Divide both sides by 3</em>

x=7

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Kevin wants to buy an area rug for his living room. He would like the area rug to be no smaller that 48 square feet and no bigge
mariarad [96]

Answer:

8-10 feet

Step-by-step explanation:

If the length of the carpet is two more than the width, the width can be expressed as x and the length can be expressed as x+2. This means that the area(x^2+2x) must be greater than 48 but no less than 80.

Now we can solve for both the maximum and minimum cases:

x^2+2x=48, x^2+2x-48=0, now we can factor, (x+8)(x-6)=0, and now we can use the Zero Product Property to find x=-8;x=6. Since we cant have negative width, x at least has to be equal to 6.

x^2+2x=80,x^2+2x-80=0, now we can factor, (x+10)(x-8), and now using the Zero Product Property to find x=-10;x=8, and since it must be positive, at most x can equal 8.

Now since the length is two more than the width, x, you add two to both of these values and get a range of 8-10 feet.

3 0
4 years ago
State the value of the discriminant. Then determine the number of real roots of the equation. n(7n + 8) = –10
Viktor [21]

Answer:

  a.  -216, 0 real roots

Step-by-step explanation:

The discriminant of ...

  ax² + bx + c = 0

is ...

  d = b² -4ac

When we put your equation into the standard form shown above, we get ...

  7n² +8n +10 = 0

Then we can identify a=7, b=8, c=10. The discriminant is then ...

  d = 8² - 4·7·10 = 64 -280 = -216

___

The interpretation of the discriminant is ...

  • < 0; no real roots (2 complex roots)
  • = 0; one real root (multiplicity 2)
  • > 0; 2 real roots

Your discriminant is -216, so there are 0 real roots.

7 0
3 years ago
What is equivalent to 16.8 - 18.6
In-s [12.5K]

Answer:

16.8-18.6= -1.8

Step-by-step explanation:

It must be negative

4 0
3 years ago
A dinner bill of 13.37 had 6% added to that total. What was the amount of the tax
yanalaym [24]
All you need to do is multiply 13.37 by the 6% and then Again by 7%.

It would be 13.37 • 1.06 ( The One makes an Increasing Function) Which Equals 14.17. Now Multiply the 14.17 by 1.07 and you'd get 15.16.

If you are just looking for the 6% it would equal 14.17 - 13.37 = 0.80.

That makes the Tax .80 Cents
7 0
4 years ago
180 red marbles to 145 blue marbles
saul85 [17]

Answer:

325

Step-by-step explanation:

180+145 xDDDD

6 0
3 years ago
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