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
Doss [256]
2 years ago
15

PLEASE HELP! SO CONFUSED! 25 POINTS!!

Mathematics
1 answer:
MrRa [10]2 years ago
7 0

Answer:

D

Step-by-step explanation:

(f • g)(x)

= f(x) × g(x)

= (x + 4)(3x² - 7)

each term in the second factor is multiplied by each term in the first factor , that is

x(3x² - 7) + 4(3x² - 7) ← distribute both parenthesis

= 3x³ - 7x + 12x² - 28

= 3x³ + 12x² - 7x - 28 ← in standard form

You might be interested in
In traveling across flat land, you notice a mountain directly in front of you. Its angle of elevation (to the peak) is . After y
Alla [95]

Answer:

In traveling across flat land, you notice a mountain directly in front of you. Its angle of elevation (to the peak) is 3.5°. After you drive x = 13 km closer to the mountain, the angle of elevation is 9°. Find the height of the mountain (round to one decimal place). Just enter the height value with one decimal. Do not enter the unit.

The height of the mountain is 1.2 km without unit it is only 1.2

Step-by-step explanation:

Given:

Two angle of elevation.

We have to find the height of the mountain.

Let the height be "h" .

Note:

Angle of elevation will increase as we move closer to the object.

Considering the distance from 3.5 ° as (13+x) km

Using trigonometric ratios:

For adjacent side "x".

⇒ tan(\theta) = \frac{opposite}{adjacent}

⇒ tan(9) = \frac{h}{x}               <em> ...equation (i)</em>

⇒ x\times tan(9) = h         <em>...equation (ii)</em>

For adjacent side "(13+x)"

⇒ tan(\theta) = \frac{opposite}{adjacent}

⇒ tan(3.5) = \frac{h}{13+x}          <em>...equation (iii)</em>

 Dividing equation (i) and (iii).

⇒ \frac{tan(9)}{tan(3.5)} =\frac{h}{x}\times \frac{13+x}{h}

⇒ 2.58 =\frac{13+x}{x}                  <em>...cross multiplication</em>

⇒ 2.58x=13+x

⇒ 2.58x-x=13+x-x   <em>...subtract x both side</em>

⇒ 1.58x=13

⇒ x=\frac{13}{1.58}

⇒x=8.22 km

Plugging x=8.22 km in equation (ii) we can find h that is the height of the mountain.

So,

⇒ x\times tan(9) = h

⇒ 8.22\times 0.15 =h

⇒ 1.23 = h

The height of the mountain is 1.23 km with one decimal it is 1.2 km only.

4 0
3 years ago
If I average a speed of 60 miles per hour while driving, how many hours of driving time will it take me to reach Arizona?
Mumz [18]

Answer:

Well where do you start

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Chase took a taxi from his house to the airport the taxi company charged a pick up fee $1.20 plus $4.75 Per mile . The total far
taurus [48]
I believe that the taxi went 10 miles

3 0
2 years ago
The sum of two numbers is -5. The difference of the two number is -17. What is the product of the two numbers?
natulia [17]
The sum is 20 okay by the way it’s wrong u
3 0
3 years ago
Can someone help me with this. Will Mark brainliest.
Oxana [17]

Answer:

Step-by-step explanation:

797.2

5 0
3 years ago
Other questions:
  • Can anyone help me with #4
    13·2 answers
  • (8x+1)+(4x+11)=180°<br>solve for x
    12·1 answer
  • Suppose $1750 is put into an account that pays an annual rate of 4.5%
    6·1 answer
  • Evaluate 4(3-1)² i need help with this
    11·2 answers
  • sarah simplify each of the Expressions what is the difference between the values of the two expressions 3 * 12 - 9 + 10 * 3 (12
    14·1 answer
  • What is 42 inches plus 2.5 feet plus 1.5 yards equal?
    11·1 answer
  • What is the value of x in the equation -6 +x= -1?<br> 0-5<br> 0-7<br> 07<br> 05<br> Help please
    9·2 answers
  • Can I get some help plz
    13·2 answers
  • Naomi says that the graph represnts a proportional relationship because it is a straight line. Is Naomi reasoning correct explai
    12·1 answer
  • John's monthly salary is $810. He spends 5/9 of it on rent, 1/3 of it on
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!