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Alex777 [14]
3 years ago
8

Find the sum. A. 4x2 – x – 5 B. 10x2 + 7x – 5 C. –10x2 + 7x + 11 D. 4x2 + x – 11

Mathematics
1 answer:
Kobotan [32]3 years ago
7 0

Answer:

A

Step-by-step explanation:

7x² - 4x - 8 - [ -3x² - 3x - 3]

In subtraction, flip the sign of all terms in the minuend

   7x² - 4x - 8

  <u> 3x² + 3x + 3</u>

   4x² - x - 5

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What is the value of x?
vredina [299]

Answer:

<em>x=</em><em>3</em><em>0</em><em>°</em>

hopefully this answer can help you to answer the next question

6 0
3 years ago
Is it true 5.14 = 21/4?
Blizzard [7]
I think that so...............
6 0
3 years ago
I need help i dont know what to do
vladimir1956 [14]

9514 1404 393

Answer:

  ∠CAB = 28°

  ∠DAC = 64°

Step-by-step explanation:

What you do in each case is make use of the relationships you know about angles in a triangle and around parallel lines. You can also use the relationships you know about diagonals in a rectangle, and the triangles they create.

<u>Left</u>

Take advantage of the fact that ∆AEB is isosceles, so the angles at A and B in that triangle are the same. If we call that angle measure x, then we have the sum of angles in that triangle is ...

  x + x + ∠AEB = 180°

  2x = 180° -124° = 56°

  x = 28°

The measure of angle CAB is 28°.

__

<u>Right</u>

Sides AD and BC are parallel, so diagonal AC can be considered a transversal. The two angles we're concerned with are alternate interior angles, so are congruent.

  ∠BCA = ∠DAC = 64°

The measure of angle DAC is 64°.

(Another way to look at this is that triangles BCE and DAE are congruent isosceles triangles, so corresponding angles are congruent.)

8 0
3 years ago
What is the theoretical probability a fair coin will land on tails?
Harman [31]

There are two sides in a coin so the chance of getting tails is 1/2, which would be 0.5.

I'm not sure tho.

5 0
3 years ago
How do you invert and multiply to divide 2/3÷4
Ira Lisetskai [31]
2/3  ÷  4

2/3 ÷ 4/1

We invert the 4/1 to 1/4 and multiply out.

2/3  ×  1/4

= 1/3 × 1/2                              2 into 4 is 2.

= 1/(3 × 2)

= 1/6

Hope this helps.
4 0
3 years ago
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