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strojnjashka [21]
3 years ago
14

1. -7-(-2) *

Mathematics
1 answer:
Morgarella [4.7K]3 years ago
8 0
1. -7-(-2)
= -7+2= -5

2. 5-(-3)
= 5+3=8

3. -6-4
= -6+(-4)= -10

4. -3-(-3)
= -3+3= 0
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What is 45% of 78? Plaese help or else idk i just needed to type more.
zepelin [54]
78×45/100
=35.1. As a result, 35.1 is 45% of 78. Hope it help!
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3 years ago
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Nine more than seven times a number, n, gives the same value as one more than the square of the number. Write an equation and so
Maru [420]

Answer:

7n + 9 = n² + 1

n = -1, 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

Equality Properties

<u>Algebra I</u>

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Step-by-step explanation:

<u>Step 1: Set up Equation</u>

"Nine more" is + 9

"Seven times a number" is 7n

"One more" is + 1

"Square of the [same] number" is n²

7n + 9 = n² + 1

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

  1. Subtract 7n on both sides:                    9 = n² - 7n + 1
  2. Subtract 9 on both sides:                      0 = n² - 7n - 8
  3. Factor quadratic:                                    0 = (n - 8)(n + 1)
  4. Solve roots:                                            n = -1, 8
4 0
2 years ago
What is the value of c such that x^2+14x+c is a perfect-square trinomial?
polet [3.4K]

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a=1 ,b=14, c=?

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(14)^2-4(1)(c)=0

196-4c=0

196=4c

c=49

Check:

(x)^2+2(x)(7)+(7)^2

x^2+14x+49

(x+7)^2  

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2 years ago
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Korolek [52]
Ummm let me see so what u have to do is
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3 years ago
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ale4655 [162]
Area of rectangle = length x breadth
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2 years ago
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