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Svetlanka [38]
4 years ago
15

Which statements are true check all that apply

Mathematics
1 answer:
zepelin [54]4 years ago
4 0

Answer: The true statements are:

Statement 1: The equation |-x -4| = 8 will have two solutions

Statement 5: The equation | 0.5x  - 0.75 | + 4.6 = 0.25 will have no solutions.


Explanation:

These are six completely different and independent statements. Every one has one equation that needs to be solved.

Which statements are true?

A. Statement 1: The equation |-x -4| = 8 will have two solutions

Answer: true

Justification:

1. First step is to remove the bars of the absolute value function:

  • | - x - 4 | = 8

        ⇒ - x - 4 = 8 or - x - 4 = - 8

2. Solve first equation: - x - 4 = 8

  • addition property of equality (add 4): - x =  8 + 4
  • combine like terms: - x = 12
  • multiplication property of equality (multiply by -1): x = - 12

3. Solve second equation: - x - 4 = - 8

  • addition property of equality (add 4): - x = -8 + 4
  • combine like terms: - x = - 4
  • multiplication propery (multiplicate by -1): x = 4

Hence, the equation has two solutions x = - 12 and x = 4


B. Statement 2: The equation 3.4|0.5x - 42.1| = - 20.6 will have one solution.

Answer: false.

Justification:


  • The left hand side cannot be negative, because the absolute value is always positive, and the right hand side is negative, hence, the equality is false.

C. Statement 3: The equation | (1/2)x - 3/4 | = 0 has no solutions

Answer: false

Justification:

  • Since 0 is not either positive or negative the only solution of that equation is (1/2x) - 3/4 = 0
  • By the addition property: (1/2)x = 3/4
  • By the multiplication property: x = 2(3)/4 = 3/2

Therefore, the equation has one solution.


D. Statement 4: |2x - 10 | = - 20 will have two solutions

Answer: false

Justification:

  • The left hand side is cannot be negative, and the right hand side is negative, hence the equality can never be true.

E. Statement 5: The equation | 0.5x  - 0.75 | + 4.6 = 0.25 will have no solutions.

Answer: true.

Justification:

  • Since the absolute value cannot be negative, when you add it to 4.6, you will obtain a number greater than or equal to 4.6, hence the left hand side will never be equal to the right hand side (0.25), making the statement false.

F. Statement 6: the equation | (1/8)x - 1 | = 5 will have infinetely many solutions.

Answer: false:

Justification:

1. Remove the bars:

  • | (1/8)x - 1 | = 5 ⇒ (1/8)x - 1 = 5 or (1/8)x - 1 = - 5

2. You do not need to solve the equations to see that you will obtain only two solutions. Hence, the statement is false.


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==============================================

Work Shown:

5 & 5/8 = 5 + 5/8

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So,

( -5 & 5/8 ) + ( 3 & 1/2 )

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------------------------

Alternative Method

We could convert each mixed number to decimal form

-5 & 5/8 = -5-5/8 = -5.625

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( -5 & 5/8 ) + ( 3 & 1/2 ) = -5.625+3.5 = -2.125

Then convert back to mixed number form

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‼️PLEASE HELP‼️‼️ Juan has $13 dollars in his piggy bank. Each week on Monday, he gets $10 for his allowance . Write a function
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Answer:

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Come up with your own system to measure angles. What would you call your unit of measure and how would it work. Describe your sy
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Answer:

You can try a picture memory method to help students

An example write down notes of what the triangle laws are for angles.

Then interpret them into your picture measurement theory.

Example could be the perpendicular measures of a right angle can be used

to find an area would be the M but as we are finding angles we could use the Big A instead of degrees sign.

We could provide pictures of cars to represent trigonometry

Where back wheels opposite angles and sides from slant are both the unit measure used in  Side/sin( A) x sin (B)   so this way you label the car wheel angle above of the square boot 'side on' and this angle is A

The B is the one above it linking the slant to find the other measure.

You are asked to design a theme around measuring angles so you need to look at other sin cos and tan calculus to design a picture that can create an image like i've given to find slant.

You need to one that finds angles.

However if you do find a car can help you can always call it square boot as in square root, considering 2/3 of sin cos and tan are square root measures.

Step-by-step explanation:

See the attached ideas and trigonometry

Picture memory Trigonometry

Picture 1. Sunrise Ah side looks for side measure.

The number above is the hypotenuse

A/H = cos ( ) x hyp =base A/H = cos ( ) x hyp = side

Picture 2.Sunrise Soh looks for side measure.

The number above it is the hypotenuse

O/H = sin ( ) =p (for product) take the p x hyp.

Picture 3 Sunrise Toast (Toa) looks for side measure = O/A

Tan ( lower angle ) x base = side

Picture 4 Side of car (Soh) with window as hypotenuse.

Two wheels are the 2 angles given and the back seat is perpendicular to both wheels =

so the triangle structure looks like this /00|7

so you type in 7/sin ( 1st wheel) x (2nd wheel) = hypotenuse.

Both angles given or worked out this is when this is used.

Picture 5 Electric mast looking for slope SIN =S/P = O/A

Angle at top

We have the side at 70 and looking for the slope

Sin( top angle) = p then side/p = hyp

Picture 6

Top angle and base given creates a T this means half both of them before dividing.

To find hypotenuse

Half = 1/2 base / sin (1/2) = hypotenuse

Picture 7

Top angle and base given creates a T this means half both of them before dividing.

To find height =

Half = 1/2 base /Tan 1/2) = Triangle height.

Key checker after pictures are drawn is;

sunrise = low angle x side or low angle x base = hypotenuse.

car = backseat x wheels = hypotenuse always remember when car on side the first

wheel first, second wheel 2nd first in the calculator. The wheels are the 2 angles that

make the car when flipped.

Half = 1/2 base / sin (1/2) = hypotenuse

Half = 1/2 base / tan (1/2) = height

Just take care with top angle and lower angle key words in the drawing descriptions and then the pictures will help.

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4 years ago
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