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Mrrafil [7]
2 years ago
15

NEED ASAP . 19 MINUTES LEFT GIVNG BRAINLIEST PLZZZZ

Mathematics
1 answer:
Evgen [1.6K]2 years ago
3 0

Answer:

9

Step-by-step explanation:

so sorry if im too late...

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I need help fasst plz help will give brainliest!!!
guapka [62]

Answer:

B

Step-by-step explanation:

3 0
3 years ago
Work out the formula of the nth term in the following quadratic sequence:<br> 19, 15, 9, 1...
Butoxors [25]

In a quadratic sequence we'll get a linear first difference and a constant second difference.  Let's verify that.

n          1   2   3   4

f(n)       19  15  9   1

1st diff   -4  -6  -8

2nd diff     2   2

We see that we got a constant second difference.  We could just extend that and work back up to get more values.

n          1   2   3   4       5    6      7

f(n)       19  15  9   1      -9   -21   -35

1st diff   -4  -6  -8   -10  -12   -14

2nd diff     2   2    2     2    2

That's just an aside; we're after the general formula.  We have

f(1)=19, f(2)=15, f(3)=9

In general we can assume

f(n) = an²  + bn + c

We get three equations in three unknowns,

19 = a(1²)+b(1)+c = a+b+c

15 = a(2²) + b(2) + c = 4a + 2b + c

9 = a(3²) + b(3) + c =  9a + 3b + c

That's a 3x3 linear system; it's easy to solve directly.  Subtracting pairs,

4 = -3a - b

6 = -5a - b

Subtracting those,

-2 = 2a

a = -1

b = -3a -4 = -1

c = 19-a-b = 21

Answer: f(n) = -n² - n + 21

Check:

f(1) = -1 - 1 + 21 = 19, good

f(2) = -4 - 2 + 21 = 15, good

f(3) = -9 - 3 + 21 = 9, good

f(4) = -16 - 4 + 21 = 1, good

Let's check our extended table, how about

f(7)= -49 - 7 + 21 = -35, good

6 0
3 years ago
In 2003 Exxon Mobil received a contract from the government worth $756,733 while Aerospace received a contract from the governme
lutik1710 [3]

The combined total of their contracts is $1,296,250

<h3>How to determine the combined total?</h3>

The values of the contracts are given as:

  • Exxon Mobil= $756,733
  • Aerospace = $539,517

The combined total is represented as:

Total = Exxon Mobil + Aerospace

Substitute known values

Total = $756,733 + $539,517

Evaluate the sum

Total = $1,296,250

Hence, the combined total of their contracts is $1,296,250

Read more about sum and total at:

brainly.com/question/4916384

#SPJ1

4 0
1 year ago
Solve the equation 12+ 0.35×=20.05
lbvjy [14]
12 + 0.35X = 20.05
12 + 0.35X - 12 = 20.05 - 12
0.35X = 8.05 
0.35X/0.35 = 8.05/0.35
X = 23
Hope this helps!! 
8 0
3 years ago
A softball player made a hit 34 times in the last 170 times at bat . Find the probability that the softball player will get a hi
Gennadij [26K]

Answer:

1/5

Step-by-step explanation:

34/170 = 1/5

p(hit) = 1/5

6 0
2 years ago
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