a tree with a height of 4m casts a shadow 15 m long on the ground. How high is another tree that casts a shadow which is 20m lon
1 answer:
You might be interested in
Answer:
The predominant formula that will be used to solve the problem is,
.
Step-by-step explanation:
Kellogg is planning to market a new kind of cereal and wants to determine the percentage of people will like it.
Kellogg will market the cereal if at least half of the people in the population will like it.
So, the company’s research department selected a random sample of 500 persons and asked them to taste it. Of these 500 persons, 280 said they liked it.
The hypothesis to test whether Kellogg will market the cereal is:
<em>H₀</em>: Kellogg will not market the cereal, i.e. <em>p</em> < 0.50.
<em>Hₐ</em>: Kellogg will market the cereal, i.e. <em>p</em> ≥ 0.50.
The decision rule:
A 95% confidence interval for single proportion can be used to draw conclusion about this test.
If the 95% confidence interval consists of the null value, i.e. <em>p</em> < 0.50, then the null hypothesis will not be rejected. But is the confidence interval does not consist of the null value then the null hypothesis will be rejected.
The formula to compute the 95% confidence interval for the proportion of all people who like this cereal is:
Here,
= sample proportion
= critical value of <em>z</em> for <em>α</em> = 0.05
Thus, the predominant formula that will be used to solve the problem is,
.
Answer:
The area would be '15l - l²
Step-by-step explanation:
Given,
By 30 feet of wire fencing we need to make a rectangular shape,
Thus, perimeter of such rectangle = 30 feet,
We know that,
Perimeter of a rectangle = 2( length + width)
if length = l feet,
⇒ 2(l + width) = 30
⇒ 2l + 2 × width = 30
⇒ 2 × width = 30 - 2l
⇒ width = = (15-l) feet,
Now, area of the rectangle,
A = length × width
= l × (15-l)
= 15l - l²
Which is the required polynomial expression.
Note :
Polynomial expression : an expression having terms consisting coefficients and variables separated by addition, subtraction and multiplication.