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yawa3891 [41]
3 years ago
9

A farmer divided his piece of land into 2 equivalent groups and the quality of the soil is the same in both of these groups. He

used fertilizers for the first group of land. He did not use fertilizers for the second group of land. At the end of the season, he measured the yield of the crops in these 2 groups. Is the study observational or experimental
Mathematics
1 answer:
Dimas [21]3 years ago
7 0

Answer:

  1. Observational would mean that he (farmer) has no direct impact or change on the statistical study.
  2. Experiment would mean that he imposed a certain treatment up a group in this case it would be the land.
  3. Hence we can determine that the the study was an experimental one.
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Please help me solve this for 15 points! <br><br>-x2 + 4x - 54 = 0​
Mazyrski [523]

Answer:

x1 =2-5i*sqrt(2)

x2 =2+5i*sqrt(2)

Step-by-step explanation:

-x^2 +4x-54=0 (quadratic equation)

a=-1, b=4, c=-54

x1=(-b+sqrt(b^2-4ac))/2a

x1=(-4+sqrt(4^2 - 4*(-1)(-54))/2*(-1)

x1=(-4+sqrt(16-216))/(-2)

x1 =(-4+sqrt(-200))/(-2)

x1 =(-4+sqrt(200i^2))/(-2) i^2=-1

x1 =(-4+sqrt(100*2*i^2))/(-2)

x1 =(-4+10i*sqrt(2))/(-2)

x1 =2-5i*sqrt(2)

x2 =(-b-sqrt(b^2-4ac))/2a

x2 =(-4-10i*sqrt(2))/(-2)

x2 =2+5i*sqrt(2)

7 0
3 years ago
Read 2 more answers
A nontoxic furniture polish can be made by combining vinegar and olive oil. The amount of oil should be three times the amount o
Len [333]

Answer:

<u>V</u><u>=</u><u>8</u><u>.</u><u>5</u>

Step-by-step explanation:

o=oil. vinegar=v. furniture polish=f

O=3v

34= 3v + v

Using a system of guessing and checking if that number fits equation you can tell that 8 causes the equation to be unequal and also 9. You can learn V must be between 8 and 9 so 8.5 might fit the equation. <u>8.5</u><u>=</u><u>V</u>

6 0
3 years ago
Graph the line by plotting any two ordered pairs that satisfy the equation.
ollegr [7]

Answer:

(0,-4)

(3,0)

Step-by-step explanation:

Let start at the orgin.

This is a linear equation since the equation is in the form of

y = mx + b

where m is the slope and b is the y intercept.

Since we starting at the orgin, and b is our y intercept.

Our first point is

(0,-4).

since the slope is 4/3.

We would rise 4 from the y value and run 3 to the x value.

In other words, to find your second point, go up 4 units from the first point and move to the right 3 units.

So our next point is at

(3,0).

U can continously go up 4 units and move 3 units to the right to find other points.

6 0
3 years ago
47.76 divided by 4.8
Vesna [10]

Answer:

the answer is 9.95

6 0
3 years ago
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Simply the complex fraction 2/3/1/3
Alexxandr [17]

Answer:

the answer is 2

Step-by-step explanation:

2/3/1/3 were going to take 1/3 multiply it by 2/3 and switch the nume and the deno.

2/3 x 3/1 = 6/3

6/3 = 2


3 0
3 years ago
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