Hey Y'all i really need help with this i will award the brainliest and 40 points

What is the common difference in the following arithmetic sequence 7,3,-1,-5

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Which statement about the relative areas of δabc and δxyz is true? the area of δabc > the area of δxyz the area of δabc < the area of δxyz the area of δabc = the area of δxyz more information is needed to compare.