Find the values of U1, and d for an arithmetic sequence with U 20 = 100 and U 25 = 115. a) u1= 43, d=3
b) u1= 57, d=3
c) U1 = 40, d = 15
d) u1 = 40 d = 3

I’m still confused on how to work the percentages

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

G. how many different 6-letter arrangements can be formed using the letters in the word absent, if each letter is used only once? a. 6 b. 36 c. 720 d. 46,656