√-90=ai√b what is the value of a and b?
1 answer:
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Now this may or may not be work I’m 99.9 percent sure it’s right but if not sorry
Answer: 169.2 per acre are produced if a field is in the top 25%.
Step-by-step explanation:
Given: The mean rain-fed corn yield of harvested fields are normally distributed, produce 147.2 bushels per acre with a standard deviation of 33 bushels per acre.
Let X denote the mean rain-fed corn yield of harvested fields.
Let x denotes the number of bushels per acre are produced if a field is in the top 25%.
Top 25% on a density curve means , (100-25%)i.e. 75% area lies below x.
I.e.
.
Z-score for p-value of 0.75 (one tailed)=0.67 [By z-table]
Then,
Here approx value is 169.2 (from options).
So, 169.2 per acre are produced if a field is in the top 25%.
4x - 2 = 2x - 10
First, subtract 2x from both sides. / Your problem should look like:
Second, subtract 4x - 2 - 2x to 2x - 2. / Your problem should look like:
Third, add 2 to both sides. / Your problem should look like:
Fourth, simplify -10 + 2 to get -8. / Your problem should look like:
Fifth, divide both sides by 2. / Your problem should look like:
Sixth, simplify
to 4. / Your problem should look like: 
Answer: x = -4
First, subtract 2x from both sides. / Your problem should look like:
Second, subtract 4x - 2 - 2x to 2x - 2. / Your problem should look like:
Third, add 2 to both sides. / Your problem should look like:
Fourth, simplify -10 + 2 to get -8. / Your problem should look like:
Fifth, divide both sides by 2. / Your problem should look like:
Sixth, simplify
Answer: x = -4