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likoan [24]
2 years ago
8

A quadratic function is defined by p(x)=(x−1)(x+3).

Mathematics
1 answer:
denis-greek [22]2 years ago
7 0
<h3>Explanation:</h3>

y = (x - 1)(x + 3)

Find y intercept:

y = (0 - 1)(0 + 3)     ⇒       y = -3

coordinates: (0, -3)

Find x intercept:

(x - 1)(x + 3) = 0        ⇒     x = 1, x = -3

coordinates of x intercept: (1, 0), (-3, 0)

Vertex: x = -b/2a = -2/2(1) = -1

y = (-1 -1)(-1 +3) = -4

coordinates: (-1, -4)

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(Set up and solve the system, then answer the associated question)
Dimas [21]

9514 1404 393

Answer:

  • red division: 6 teams
  • blue division: 5 teams

Step-by-step explanation:

We can let r and b represent the numbers of teams in the red and blue divisions, respectively. The total number of goals scored in each division will be the average for that division times the number of teams in that division.

  r - b = 1 . . . . . . there is 1 more red team than blue

  4.5r +4.2b = 48 . . . . . . total goals scored per week

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Solving by substitution, we have ...

  r = b +1

  4.5(b +1) +4.2b = 48 . . . . substitute for r

  8.7b +4.5 = 48 . . . . . . . . simplify

  8.7b = 43.5 . . . . . . . . . . subtract 4.5

  b = 43.5/8.7 = 5 . . . . . divide by 8.7

  r = b +1 = 6 . . . . . . . . . find r

There are 6 red teams and 5 blue teams.

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<em>Additional comment</em>

The basic idea is that you make an equation for each relation given in the problem statement. For a problem like this, you do need to have an understanding of how the average number of goals would be calculated and how that relates to the total goals.

8 0
2 years ago
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6 0
3 years ago
Can you add 23 and 40 without regrouping
Blizzard [7]
Yes because 0 and 4 dont equal 10 and 20 and 40 dont equal 100. So no and 40 + 23 = 63.
7 0
3 years ago
Read 2 more answers
A music store has 500 guitar picks. They order 15 boxes with 9 picks each. They sell 19 boxes that have 10 picks each. The store
weqwewe [10]

Answer:

yes

Step-by-step explanation:

6 0
2 years ago
1/3k+80=1/2k+120 what does k equal?
LenaWriter [7]

Answer:

k = -1/240

Step-by-step explanation:

to evaluate the value of k in the expression 1/3k+80=1/2k+120

we have

1/3k+80=1/2k+120

collect the like terms for easy evaluation

1/3k - 1/2k = 120 -80

1/3k - 1/2k = 40

find the lcm

2 - 3/6k = 40

-1/ 6k = 40

cross multiply

6k  x  40  = -1

240k = -1

divide both sides by 240

240k/240 = -1/ 240

k = -1/240

therefore the value of k in the expression 1/3k+80=1/2k+120 is equals to -1/240

8 0
3 years ago
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