Ackerman and goldsmith (2011) found that students who studied text from printed hardcopy had better test scores than students who studied from text presented on a screen. in a related study, a professor noticed that several students in a large class had purchased the e-book version of the course textbook. for the final exam, the overall average for the entire class was μ = 81.7, but the n = 9 students who used e-book had a mean of m = 77.2 with a standard deviation of s = 5.7. on the basis of these data, can the professor conclude that students using e-books had significantly lower scores than the regular class? use α = .05 with a one-tailed test.

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answer:   (7x + 6y) ( 49x^2 - 42xy + 36y^2)

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

(7x + 6y) ( 49x^2 - 42xy + 36y^2)

you,

mrb

(a + b) (a^2 - a b + b^2)

the median is   36 orr sum like dat

step-by-step explanation:

h is the x-coordinate of the vertex

step-by-step explanation:

we have

in this function

the point represent the vertex of the function

so

h is the x-coordinate of the vertex

k is the y-coordinate of the vertex