Answer: $13200
Step-by-step explanation:
If 100 square feet of roofing is installed for a cost of $1,200
1,100 square feet would cost $Z (let the unknown cost be Z)
i.e 100 ft^2 = $1,200
1100 ft^2 = $Z
Hence, to get the value of Z, cross multiply
Z x 100 = 1200 x 1100
100Z = 130000
Divide both sides by Z
100Z/100 = 1320000/100
Z = $13200
Thus, $13200 is the cost to have 1,100 square feet of roofing sheet installed
D. 24.84KM/H
Because 6.9m/s x 1KM/1000m x 3600s/1h = 24.84KM/H
Answer:
39
Step-by-step explanation:
These are congruent, one triangle is twice as big as the other. 117/2=54
so we know that one is twice as big as the other.
78/2=?
?=39
Answera and Step-by-step explanation: Correlation Coefficient is the measure of how strong two variables are. There are numerous types of correlation coefficients and the product moment correlation coefficient, also known as <em>Pearson's correlation</em> or <em>Pearson's R</em> is most commonly used in linear regression. The formula to calculate it is:
r = n(∑xy) - (∑x)(∑y) / √[∑x² - (∑x)²].[n∑y² - (∑y)²]
To find the value of R:
1) Separate the values of X and Y and out them in 2 columns.
2) Add 3 more columns: for xy, x² and y²;
3) Find the values of each column;
4) Add each column;
5) Put the sum of each column in its place on the formula above;
6) Find the correlation.
i) For this question, r = 0.9645. As it's <u>positive</u>, means that the two variables are directly linked, i.e., an increase in one variable will produce an increase in the other variable in the same proportion.
ii) The Senator should distribute Norvasc to the old adults groups, because, as the <u>population grows</u>, the death associated with high blood pressure will <u>also grow</u>, as explained by the correlation coefficient.