Decompose into factors X ^ 2y ^ 2 - 121.

9x ^ 4 - 144y ^ 4

25x ^ 2 y ^ 6 - 81z ^ 10

225 - 16a ^ 12 b ^ 16

(x - 1) 2 - 25y ^ 2.

(5x + 2) 2 - y ^ 8.

0.09p ^ 4 - 6.25q ^ 6.

9r ^ 6m - 64s ^ 2m + 10.

(2x + 5y) 2 - 1628.

Helpp

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?