Which is equivalent to (9 y squared minus 4 x)(9 y squared + 4 x), and what type of special product is it? 81 y Superscript 4 Baseline minus 16 x squared, a perfect square trinomial
81 y Superscript 4 Baseline minus 16 x squared, the difference of squares
81 y Superscript 4 Baseline minus 72 x y squared minus 16 x squared, a perfect square trinomial
81 y Superscript 4 Baseline minus 72 x y squared minus 16 x squared, the difference of squares

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

step-by-step explanation:

coldest temperature they recorded add me europa2433

europa2433

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0