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sergij07 [2.7K]
2 years ago
7

Given f(x) = -x – 4, find f(4). I need help

Mathematics
1 answer:
Brums [2.3K]2 years ago
5 0

Answer:

f(4) = -8

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

<u>Algebra I</u>

  • Function Notation

Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = -x - 4

f(4) is x = 4

<u>Step 2: Evaluate</u>

  1. Substitute in <em>x</em>:                  f(4) = -4 - 4
  2. Subtract:                            f(4) = -8
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Solve the system y= -x + 7 and y=0.5(x - 3)^2
solniwko [45]

Answer:

(- 1, 8 ) and (5, 2 )

Step-by-step explanation:

Given the 2 equations

y = - x + 7 → (1)

y = 0.5(x - 3)² → (2)

Substitute y = 0.5(x - 3)² into (1)

0.5(x - 3 )² = - x + 7 ← expand and simplify left side

0.5(x² - 6x + 9) = - x + 7 ( multiply both sides by 2 )

x² - 6x + 9 = - 2x + 14 ( subtract - 2x + 14 from both sides )

x² - 4x - 5 = 0 ← in standard form

(x - 5)(x + 1) = 0 ← in factored form

Equate each factor to zero and solve for x

x - 5 = 0 ⇒ x = 5

x + 1 = 0 ⇒ x = - 1

Substitute these values into (1) for corresponding values of y

x = 5 : y = - 5 + 7 = 2 ⇒ (5, 2 )

x = - 1 : y = 1 + 7 = 8 ⇒ (- 1, 8 )

8 0
2 years ago
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Given the geometric sequence where a1 = 4 and the common ratio is 3, what is the domain for n?
svlad2 [7]

Answer:

The correct option is A.

Step-by-step explanation:

According to statement a1 = 4 and r = 3. This shows that r is greater than 1.

If r is greater than 1 than it includes integers greater than 1 or equal to 1. It does not include all the real numbers because real numbers include negative numbers also.

If starting value is 4,if we put n=0, then we get 4, but if we put a negative value than we would get a number which is not a part of our sequence. Thus the correct option is All integers where n ≥ 1....

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$7.80/hour = ____ cents/minute? a. 13 b. 8.8 c. 780 d. 4.7
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$7.80/hour =  (7.8*100) cents / (1*60)minutes
 
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<span>Option a</span>
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Please help! foil the problems 1. (3xy - 1) (4xy + 2) 2. (2x - 3y)(4x - y) 3. (ab - 9)(ab + 8) 4. (m 3 n + 8)(m 3 n - 5) 5. (3 -
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I am going to do the first 2 problems and show my work that way you know how to do it yourself.

So first of all, the foil method:

(a+b) (c+d) = ac+ad+bc+bd

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    (2x-3y) (4x-y) = (8x^2) + (-2xy) + (-12xy) + (3y^2)

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I hope this helps!
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