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prohojiy [21]
3 years ago
12

In the year 2005, the average cost of a car could be modeled by the equation C= -15x^2 + 20x - 3 where x is the number of years

since 2005. By the year 2010 the average cost had changed, and the equation could be modeled by C= -10x^2 + 30x - 2. Find the difference in average cost equation for cars between 2005 and 2010.
Mathematics
1 answer:
Rudiy273 years ago
8 0

Answer:

5x^2+10x-3

Step-by-step explanation:

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Please help!!
marysya [2.9K]
Dt = 2(0.8)t = 1.6t = 1.6(10) - 1.6(5) = <span>8 m/s</span>
3 0
3 years ago
Today, the mailman sorted 57 letters during his first hour of work, 69 letters during his second hour, 81 letters during his thi
mars1129 [50]
The answer is 93 

If we sorted out the number of each hours, the sequence will look like this

57 _    69  _  81  _ x  _ 105   

(in which x is the fourth hour of work)


We can see from the sequence that each hours, the mailman add additional 12 letters.
(69 - 57 = 12)
(81 - 69 = 12)   . . . . proof


So, the amount of letters on the fourth hour would be:
81 letters  + 12 letters = 93 Letters
5 0
3 years ago
-9=k-6
Shkiper50 [21]

Answer:

k = -3

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

Step-by-step explanation:

<u>Step 1: Define</u>

-9 = k - 6

<u>Step 2: Solve for </u><em><u>k</u></em>

  1. Add 6 to both sides:                    -3 = k
  2. Rewrite:                                         k = -3
3 0
3 years ago
What is the value of x/3y , when x = 18 and y = 3? <br><br> 3/18 <br><br> 2 <br><br> 3 <br><br> 6
Anestetic [448]

x = 18

y = 3

x/3y becomes 18/3(3) = 18/9 = 2

4 0
3 years ago
Read 2 more answers
Write a rule for the function represented by the table.​
Leto [7]

y=19x+9 would be the rule

7 0
3 years ago
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