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
Dennis_Churaev [7]
3 years ago
15

il a positive number decreased by 5, then it is 84 times of its reciprocal. Find the number? op 10, 11, 12, 13​

Mathematics
1 answer:
Alenkasestr [34]3 years ago
6 0

Answer:

x = 12

Step-by-step explanation:

x - 5 = 84/x

x² - 5x = 84

x² - 5x - 84 = 0

x = (5 ±√(5² - 4(1)(-84))) / 2

x = (5 ± 19) / 2

x = -7 ignore

x = 12

You might be interested in
What should be done to these equations in order to solve a system of equations by elimination?
morpeh [17]

Answer

You can multiply the first equation by 4 and the second equation by 3.

You can multiply the first equation by 4/3.

You can multiply the first equation by 3.

Explanation

When solving a system of equations by elimination, you want to add or subtract the equations to "get rid" of a variable.

To do that, one of the variables in both equations have to have the same coefficient.

The first answer possible gives x the coefficient of 12 for both equations. You would get 12x+4y=52 and 12x-9y=39. You could subtract those equations to get 13y=13.

The second way gives x the coefficient of 4. You would multiply the first equation by 4/3 to get 4x+4/3y=52/3. You can subtract to get one variable, and then solve from there. Although, multiplying for 4/3 is annoying, so it's not suggested.

You can also "get rid" the the y. Multiply the first equation by 3 to get 9x+3y=39. You can add these equations. When you add 9x+3y=39 and 4x-3y=13 you get 13x=52.

7 0
3 years ago
If f(x)=2 sin 3x+C, then the maximum value of f(x) is:<br> 1)C<br> 2) C+2<br> 3) C+3<br> 4) C+6
Vladimir79 [104]
<h3>Answer:  C+2</h3>

Reason:

The largest sin(x) can get is 1, and the same goes for sin(3x).

Consequently, the largest 2sin(3x) can get is 2.

You can visually verify these claims by graphing each function with a tool like Desmos. Take note of the y coordinate of the highest points. See below.

Therefore, the largest f(x) = 2sin(3x)+C can get is 2+C or C+2

8 0
2 years ago
The scale of a map is 5 inch = 40 miles. If 2 cities are 15 inches apart on the map, how
galben [10]

Answer:

120 miles from border to border cause if we consider the mile zero then it depends what's the areal of a city

4 0
3 years ago
Read 2 more answers
PLEASE HELP you just have to help with a few
vagabundo [1.1K]
<h3><em>Answers:</em></h3><h2 /><h2>1/4 + 2/3 =11/12</h2><h2 /><h2>2/5-1/10= 3/10</h2><h2 /><h2>1/6+1/4=5/12</h2><h2 /><h2>5/8-1/4=3/8</h2><h2 /><h2>7/8-1/2=3/8</h2><h2 /><h2>3/10+4/5=11/10 or 1 1/10</h2><h2 /><h2>5/6-2/5=3/5</h2><h2 /><h2>5/12-1/4=1/6</h2><h2 /><h2>7/16+1/8=9/16</h2><h2 /><h2>11/16+5/8=21/16 or 1 5/16</h2><h2 /><h2>2/7+1/2=11/14</h2><h2 /><h2>4/5+3/4=31/20 or 1 11/20</h2>
3 0
2 years ago
YALL PLEASE PLEASE DIS A TEST!!
ollegr [7]
The answer would be 7 becuase if rounded
3 0
3 years ago
Other questions:
  • I need help please look at the picture thx
    12·1 answer
  • Solver for x- and y- 3x+y=12
    12·1 answer
  • HELP HelP HELP HELP HELP!!!!
    8·1 answer
  • The mean value of land and buildings per acre from a sample of farms is $1400, with a standard deviation of $100. The data set h
    8·1 answer
  • How to work out problem 6 3/4 - 8 2/3
    13·2 answers
  • Which of these is NOT an example of you being a part of history?
    7·1 answer
  • What is the answer (-9+8x)4+5x
    5·1 answer
  • The area of a rectangular garden in square feet can be represented by 22 - 102 +21. The length is 2 - 7 feet. You have been hire
    9·1 answer
  • A broken scale shows a false weight that is always less than the actual weight by the same number of ounces. When a box is put o
    9·1 answer
  • Question 3
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!