1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
creativ13 [48]
3 years ago
12

3x-10-4

Mathematics
1 answer:
snow_lady [41]3 years ago
8 0

Answer/Step-by-step Explanation:

1. 3x - 10 +4 if x = 3

To evaluate, plug in the value of x in the expression given

3(3) - 10 + 4 = 9 - 10 + 4

= 3

2. \frac{x}{2} + 6x

if x = -12

\frac{(-12)}{2} + 6(-12)

- 6 - 72 = - 78

3. 8(x - y), if x = 2, y = 6

8(2 - 6) = 8(-4) = -32

4. x + xy, if x = 3, y = -2.5

3 + (3)(-2.5) = 3 + (-7.5)

= 3 - 7.5 = - 4.5

5. (2x)² + 6, if x = -2

(2*-2)² + 6 = (-4)² + 6

= 16 + 6 = 22

6. 3x + 4y - 3x, if x = 2, y = 4

3(2) + 4(4) - 3(2) = 6 + 16 - 6

= 16

7. -10x + \frac{4}{x}

If x = -2

-10(-2) + \frac{4}{-2}

20 + (-2) = 20 - 2 = 18

8. 3(8x - 10) + 5x, if x = ½

3(8*½ - 10) + 5(½)

3(4 - 10) + 2.5

3(-6) + 2.5 = -18+2.5 = - 20.5 or 20½

9. x + 8y - (x)², if x = -5, y = ¼

-5 + 8(¼) - (-5)² = -5 + 2 - (25)

= -3 - 25 = -28

10. (8x)² + 6x + 2, if x = -3

(8*-3)² + 6(-3) + 2 = (-24)² - 18 + 2

= 576 - 18 + 2 = 560

11. 2x² + 4y² + xy, if x = ½, y = 2

2(½)² + 4(2)² + (½)(2)

= 2(¼) + 4(4) + 1

= ½ + 16 + 1 = ½ + 17 = 17½

12. 8x + 2y, if x = 1.5, y = -2.2

8(1.5) + 2(-2.2)

12 - 4.4 = 7.6

13. \frac{5}{2}(x - 6) + 4

if x = 8.

\frac{5}{2}(8 - 6) + 4

\frac{5}{2}(2) + 4

= 5 + 4 = 9

14. 3x - 8x² + 7, if x = 4.5

3(4.5) - 8(4.5)² + 7

13.5 - 8(20.25) + 7

13.5 - 162 + 7 = -141.5

15. -2x² + 8y, if x = 3, y = -9

-2(3)² + 8(-9)

-2(9) - 72 = - 18 - 72 = 90

16. (-5x)² - 3x + x, if x = -3.5

(-5*-3.5)² - 3(-3.5) +(-3.5)

(17.5)² + 10.5 - 3.5

306.25 + 10.5 - 3.5 = 313.25

You might be interested in
alan drew a polygon with four sides and four angle. All four sides are equal. None of the angle are right angle. What figure did
Nastasia [14]
Alan drew a quadrilateral that is a parallelogram and a rhombus.
4 0
3 years ago
Does someone know what the answer is? Please, help.
natita [175]

Answer:

III

Step-by-step explanation:

you got this, man! good luck [:

5 0
3 years ago
Paul is three times as old as Mary and Peter is four times as old as Mary,If the sum of their ages is 64, how old are Peter,Paul
uysha [10]
Let Mary's age be x.

Paul is three times as old as Mary, so Paul's age would be 3x.

Peter is four times as old as Mary, so Peter's age would be 4x.

The sum of their ages is 64
⇒ Paul's age+ Peter's age+ Mary's age= 64
⇒ 3x+ 4x+ x= 64
⇒ 8x= 64
⇒ x= 64/8
⇒ x= 8

Paul's age is: 3x= 3*8= 24

Peter's age is: 4x= 4*8= 32

Final answer: Paul is 24 years old.
Peter is 32 years old.
Mary is 8 years old.

Hope this helps~
7 0
3 years ago
Describe the graph of the inequality on a number line: x ≥ 11
Phantasy [73]

Answer:

Here is how it should look

Step-by-step explanation:

5 0
3 years ago
In the parallelogram below, z = ?°
katrin [286]

Answer:

z is 111 degrees

Step-by-step explanation:

69 ° and z is a linear pair, therefore:

69 + z = 180

z = 180 - 69

z= 111

7 0
2 years ago
Other questions:
  • One tea bag can brew two or three cups of tea. Anastasia and Elizabeth shared the box of tea bags equally. Anastasia made 57 cup
    15·2 answers
  • If NO = 17 and NP = 5x -6, find the value of x. Then find NO and OP.
    8·1 answer
  • Help Please?? 12. Of the following, which one is an observational study? A. Asking hearing-impaired people to try a new style of
    13·2 answers
  • Let [v1,v2,v3] be a set of nonzero vectors in r^m such that the (transpose of vi)*vj = 0 when i is not equal to j. show that the
    12·1 answer
  • 47% of 70 estimated ????? help pleazzz
    15·1 answer
  • The radius of a cylindrical construction pipe is 3.5 ft. If the pipe is 37 ft long, what is its volume?
    15·1 answer
  • The area of a square window is 81 in.² how long is each side of the window
    10·1 answer
  • on a function map, the values for the domain of the function appear on the ______ and the values for the range appear on the ___
    8·1 answer
  • In which of the following situations would someone have to pay a gift tax?
    7·2 answers
  • Two trains leave the city going opposite​ directions, one going north and the other going south. The northbound train is traveli
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!