A fuel consortium chairman at an airport wants to look at the relationship between cost of crude oil and the cost of jet fuel. The data show a linear pattern with the summary statistics shown below: mean standard deviation 30.8 cost per barrel of crude oil (dollars) = 57.4 y=cost per barrel of jet fuel (dollars) y = 69.9 8y = 35 T=0.99 Find the equation of the least-squares regression line for predicting the cost of jet fuel from the cost of crude oil. Round your entries to the nearest hundredth.

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation: