Consider the ice berg shown at the right. The iceberg is
approximately in the shape of a
cone with a height of 70 feet and
a diameter of 60 feet.
Determine the approximate
weight of the iceberg if each
cubic foot weighs approximately
50 pounds.

on friday there were 15 birds

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step-by-step explanation:

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answer: graph 2

step-by-step explanation:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

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

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81