I need help asap!! answers would be very appreciated!

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Write the rational number in lowest terms 99/-15

After reading 80% of her e-mails in her inbox, danette still has m unread e-mails. which of the following expressions could represent the number of e-mails danette had in her inbox before she started reading? choose 2 answers: (choice a) 5m (choice b) 1.8m (choice c) 80m (choice d) m/0.8 (choice e) m/1−0.8