The least-square regression line has a slope of:
m=(nΣxy-ΣyΣx)/(nΣx²-ΣxΣx)
and a y-intercept of:
b=(Σy-mΣx)/n
In this case: n=7, Σxy=4899, Σy=391, Σx=85, Σx²=1153 so
m=(7(4899)-391*85)/(7(1153)-85*85))=1058/846
b=(391*846-85*1058)/(7*846)=34408/846
So the line of best fit is:
y=(1058x+34408)/846 and if we approximated this as your answers see to have done....
y=1.25x+40.67
5.75 quarts of paint required for the project
Explanation:
Usually one quart of paint cover 100 square feet
Since, a gallon covers 250 square feet, it means that
one gallon of paint is equal to
quarts of paint.
Number of gallon required to paint 575 square feet,

So, 2.3 gallons is equal to,

Learn more:
brainly.com/question/18882920
3000000...........
10^6 =1000000 (3) = 3000000
Answer: 387
Step-by-step explanation:
Given : Standard deviation: 
Margin of error : 0.15
Critical value for 80% confidence interval = 1.2816
Required minimum sample size : 

Hence, the minimum sample size required to estimate the mean usage of water = 387
Complete Question:
On a number line, the coordinates of X, Y, Z, and W are −8, −5, 4, and 6, respectively. Find the lengths of the two segments below. Then tell whether they are congruent.
and 
Answer:


They are not congruent
Step-by-step explanation:
Length of segment XY:
Coordinate of X = -8
Coordinate of Y = -5
= |-8 -(-5)| = |-8 + 5| = 3
Length of ZW:
Coordinate of Z = 4
Coordinate of W = 6
= |4 - 6| = 2
≠
, therefore, they are not congruent.