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il63 [147K]
3 years ago
7

How are the expressions 8-15 and 8-(-15)?how are they different?

Mathematics
1 answer:
zmey [24]3 years ago
6 0

8 - 15 means subtract the positive number 15 from 8.

8 - 15 = 8 + (-15) = -7

8 - (-15) means subtract the negative number -15 from 8.

Subtracting a negative number is the same as adding a positive number.

8 - (-15) = 8 + 15 = 23

8 - 15 = -7, and 8 - (-15) = 23. The expressions mean different operations and have different answers.

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Gordon, Henry and Sarah share £48 in a ratio 2:3:1. How much money does each person get?
Alinara [238K]

Answer:

Gordon gets 16£, Henry gets 24£ and Sarah gets 8£

Step-by-step explanation:

Let the ratio be 2x + 3x + 1x

Total amount = £48

So;

2x + 3x + x = 48

6x = 48

x = 48 / 6

x = 8

Now

2x = 16

3x = 24

x = 8

5 0
3 years ago
If four times a number plus 3 is 11, what is the number? a. 4 bm 2 c. 16 d. 5​
goblinko [34]

Answer:

B. 2 (Second Option)

Step-by-step explanation:

Four times: ⇒ 4

Number:⇒  y

4y+3=11

<em>Subtract by 3 both sides of equation.</em>

<em>4y+3-3=11-3</em>

<em>Simplify.</em>

<em>11-3=8</em>

<em>4y=8</em>

<em>Divide by 4 both sides of equation.</em>

<em>4y/4=8/4</em>

<em>SImplify, to find the answer.</em>

<em>8/4=2</em>

<em>y=2 is the correct answer.</em>

<em>2 is the correct answer.</em>

6 0
3 years ago
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Step-by-step explanation:

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2 years ago
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A necklace costs a store owner $125 to purchase.The owner marks up the price 65%.What is the selling price of the necklace.
solniwko [45]
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2 years ago
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Solve for x<br> 35+.8x=43-7x
Vinvika [58]

Answer:

x = 1.02564

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> </u>

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality<u> </u>

<u>Algebra I</u>

  • Terms/Coefficients

Step-by-step explanation:

<u>Step 1: Define</u>

35 + 0.8x = 43 - 7x

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

  1. [Addition Property of Equality] Add 7x on both sides:                                 35 + 7.8x = 43
  2. [Subtraction Property of Equality] Subtract 35 on both sides:                    7.8x = 8
  3. [Division Property of Equality] Divide 7.8 on both sides:                             x = 1.02564
7 0
3 years ago
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