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Mademuasel [1]
3 years ago
11

While walking home on a dark night, Joanna saw a bright light in the sky and concluded that it must have been a spaceship from a

nother planet. Which of these questions could Joanna answer using scientific methods of investigation?
A) Can aliens read our minds?
B) Does Joanna actually believe in aliens?
C) What is the aliens spacecraft made from?
D) What percent of people in the area saw a bright light that night?
Mathematics
2 answers:
ikadub [295]3 years ago
6 0
C i believe. hope this helps :)
vekshin13 years ago
4 0
D makes sense because it's the only option that is using a legitimate form of data collection.
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Define Following:consistent equations
mario62 [17]

Answer:

1. Consistent equations

x + y = 3

x + 2·y = 5

2. Dependent equations

3·x + 2·y = 6

6·x + 4·y = 12

3. Equivalent equations

9·x - 12·y = 6

3·x - 4·y = 2

4. Inconsistent equations

x + 2 = 4 and x + 2 = 6

5. Independent equations

y = -8·x + 4

8·x + 4·y = 0

6. No solution

4 = 2

7. One solution

3·x + 5 = 11

x = 2

Step-by-step explanation:

1. Consistent equations

A consistent equation is one that has a solution, that is there exist a complete set of solution of the unknown values that resolves all the equations in the system.

x + y = 3

x + 2·y = 5

2. Dependent equations

A dependent system of equations consist of the equation of a line presented in two alternate forms, leading to the existence of an infinite number of solutions.

3·x + 2·y = 6

6·x + 4·y = 12

3. Equivalent equations

These are equations with the same roots or solution

e.g. 9·x - 12·y = 6

3·x - 4·y = 2

4. Inconsistent equations

Inconsistent equations are equations that are not solvable based on the provided set of values in the equations

e.g. x + 2 = 4 and x + 2 = 6

5. Independent equations

An independent equation is an equation within a system of equation, that is not derivable based on the other equations

y = -8·x + 4

8·x + 4·y = 0

6. No solution

No solution indicates that the solution is not in existence

Example,  4 = 2

7. One solution

This is an equation that has exactly one solution

Example 3·x + 5 = 11

x = 2

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The answer should be 33x -390

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Answer:

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Step-by-step explanation:

1) find the slope of the given line

slope = (-a/b) = (-8/4) = -2

two parallel lines have the same slope

A : correct

B : (-a/b) = -16/8 = -2 (correct)

C : correct

D : wrong (2 is different from -2)

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Tickets to a school dance cost $5. Ninety tickets have already been sold. How many more tickets x must be sold to earn at least
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Step-by-step explanation:

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