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9966 [12]
2 years ago
5

What formula could I use to solve this ? Using f(x) =-3+7 What is x when f(x) = -20

Mathematics
1 answer:
UNO [17]2 years ago
5 0

Answer:

x = 9

Step-by-step explanation:

I think you wrote the question wrong (I am assuming that there is a x next to the -3).

Subtract 7

-27 = -3x

divide by -3

9 = x

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Find all of the points on the x-axis which are 6 units from the point (−1, 1).
anyanavicka [17]
All the points that are 6 units from (-1, 1) are those on the circle
  (x+1)^2 +(y-1)^2 = 36

For y=0, the two points of interest satisfy
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  (x+1)^2 = 35 . . . . . . subtract 1
  x+1 = ±√35
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The points you seek are (-1-√35, 0) and (-1+√35, 0), about (-6.916, 0) and (4.916, 0).

5 0
3 years ago
Mrs. Smith's class is working on a variety of science experiments. Each
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Answer:

66

Step-by-step explanation:

If there are  <em>n</em>  students, then the number of pairs is \frac{n(n-1)}{2}.

With 12 students, \frac{12(12-1)}{2} = \frac{132}{2}=66 pairs can be formed.

The reason the formula works is this:  Each of the 12 students can be paired with 11 other students (no student is paired with him/her self).  But counting 12 x 11 = 132  counts each pair <u>twice</u>.  Example: student A can be paired with student B,..., student B can be paired with student A.  The pair was counted two times.

See the attached image that shows pairings of 5 students.  There are

5(5 - 1)/2 = 5(4)/2 = 10 pairs.

8 0
3 years ago
A boat traveled 27 miles in 2 hours. At this rate, how many miles will the boat travel in
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6.75 miles per half hour !!!!!!!
7 0
3 years ago
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What is the product? x^2-16/2x+8 times x^3-2x^2+x/x^2+3x-4
tankabanditka [31]

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v

x

5

−

2

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4

−

8

x

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+

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x

3

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x

2

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x

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v

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2

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x

4

-

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x

4

+

3

v

x

3

+

24

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-

4

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2

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40

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2

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v

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+

56

x

+

8

x

-

40

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8 0
3 years ago
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A bicycle store installs about 400 tires per day. Tires are installed Monday through Friday for 8 hours per day. The owner of th
dalvyx [7]
Dividing the number of tires that should be installed per day which  is 400 by the number of working hours which is 8 will give us 50 tires per hour. Assuming that the same mistake will take toll on the workers such that they will have 1 tire mistakenly installed in an hour, they will have 8 erroneous tires in a day. Multiplying this by 5 to make the answer per week will give 40. Out of the 400 x 5  = 2000 tires. The answer would be 2000 - 40 which is equal to 1940. The assumption must be valid. 
6 0
3 years ago
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