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Gemiola [76]
3 years ago
7

Which of the following statements is not true about an explanatory variable?

Mathematics
2 answers:
Anna11 [10]3 years ago
4 0
It is a dependant variable
luda_lava [24]3 years ago
3 0

Step-by-step explanation:

Explanatory variable is controlled by the researcher for the given experimental study. The researcher can put some conditions on the variable and the results are calculated. Hence, it is clear that result of the manipulated variable is noted and the manipulated variable is known as explanatory variable. There could be more than one explanatory variable.

For example consider the variables number of hours spent in practicing for a sport and the result in that sport. Here, the number of hours spent practicing influences the performance of the athlete. Hence, the variable number of hours spent is known as explanatory variable.

Also, there is one major difference between an independent variable and explanatory variable. The independent variable is not affected by other independent variables whereas for the explanatory variables, the variables are not independent.

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A soccer ball was kicked in the air and follows the path h(x)=−2x2+1x+6, where x is the time in seconds and h is the height of t
madam [21]

The ball will hit the ground at 2 seconds.

Step-by-step explanation:

Given that,

The path of the ball = h(x)=−2x2+1x+6

Here,

x is the time while h is the height of ball.

When the ball will hit the ground, the height will become zero. Therefore,

h(x)=−2x2+1x+6

0 =−2x2+1x+6

or

2x2 -1x - 6 = 0

This is a quadratic equation, hence by applying quadratic equation formula:

x = \frac{-b +- \sqrt{b^{2} - 4ac }   }{2a}

here,

a = 2

b = -1

c = -6

Putting these values in formula, we get

x = \frac{-(-1) +- \sqrt{-1^{2} - 4.2.-6 }   }{2.2}

x = \frac{1 +- \sqrt{1 + 48 }   }{4}

x = \frac{1 +- \sqrt{49 }   }{4}

x = \frac{1 +- 7   }{4}

x = 2, -3/2

As the time cannot be negative. Therefore, the ball will hit the ground at 2 seconds.

6 0
3 years ago
Read 2 more answers
What is the product of (7x+2) and 20-3x/4
fredd [130]
(7x+2)(20-3x/4) = 140x + 40 - 21x²/4 - 3x/2 = -21/4 x² + 138 1/2 x + 40

this is one of those multiplications that doesn't make the result look any simpler...
3 0
3 years ago
What is the measure of angle 2
gulaghasi [49]
22 just kidding........ 16
3 0
3 years ago
Need help worth 34 points!
exis [7]
  x + y = 3
- x        - x
        y = -x + 3

  y - y₁ = m(x - x₁)
y - (-1) = -1[x - (-1)]
  y + 1 = -1(x + 1)
  y + 1 = -1(x) - 1(1)
  y + 1 = -x - 1
     - 1         - 1
       y = -x - 2

The answer is B.
6 0
4 years ago
Read 2 more answers
Among the following, a perfect number a) 6 b)28 c) 625 d) 100​
Verdich [7]

Answer:

28 and 6

Step-by-step explanation:

List the factors (excluding itself):

6: 1, 2, 3,

28: 1, 2, 4, 7, 14

Add them up!

1+2+3=6

1+2+4+7+14=28

if they add up to the original number then the number is perfect.

6 0
3 years ago
Read 2 more answers
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