Determine which statement or statements are true. nails used = 6 ; bird houses built = 2

For every 6 nails used there were 2 bird houses built

For every 6 bird houses built there were 2 nails used

The ratio of nails used to bird houses built was 6:2

The ratio of bird houses built to nails used was 2:6

my answer is$ 12

step-by-step explanation:

because 15 -2=12

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step-by-step explanation:

there would be 162.15 calories in this cereal.

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