Which of the following are the factors of t4 – 81?

a. (t – 3)(t + 3)2
b. (t – 3)(t + 3)(t2 + 9)
c. (t2 – 9)(t2 – 9)
d. (t – 3)2(t + 3)2

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?